Feature/cdac contract renumber to v1

[noahfalk]

Follow up to #131790 to renumber the contracts starting from 1.

This PR includes all the commits in the previous one. As soon as 131790 gets merged I'll rebase and squash so this becomes a single commit.

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[Copilot]

Pull request overview

Renumbers cDAC contracts to start from c1 by folding previously-development-only contract versions into the remaining version(s), updating CoreCLR contract advertisements/registrations, tests, and the authoritative data contract docs accordingly.

Changes:

• Consolidate PrecodeStubs/ExecutionManager/DebugInfo implementations to c1 and delete superseded versioned implementations/helpers.
• Update CoreCLR contract registrations/advertisements and align unit/integration tests to the new version set.
• Refresh docs/design/datacontracts/* specs and descriptor-meaning/override metadata to match the new contract shapes.

Reviewed changes

Copilot reviewed 28 out of 28 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/native/managed/cdac/tools/CdacUsageGraph/tests/CdacUsageGraph.Tests/UsageWalkerIntegrationTests.cs	Updates usage-graph integration assertions for renumbered contract versions/fields.
src/native/managed/cdac/tests/UnitTests/PrecodeStubsTests.cs	Collapses multi-version PrecodeStubs tests to c1 and updates mock descriptor layout accordingly.
src/native/managed/cdac/tests/UnitTests/MockDescriptors/MockDescriptors.ExecutionManager.cs	Removes c2 nibblemap builder selection; c1 now uses the remaining builder.
src/native/managed/cdac/tests/UnitTests/FunctionTableAccessTests.cs	Simplifies test matrix to only run against c1.
src/native/managed/cdac/tests/UnitTests/ExecutionManager/NibbleMapTests.cs	Removes linear-lookup tests and reorients tests to helpers + constant-lookup behavior.
src/native/managed/cdac/tests/UnitTests/ExecutionManager/NibbleMapTestBuilder.cs	Removes the *_2 builder and updates *_1 to emit constant-lookup pointer encoding.
src/native/managed/cdac/tests/UnitTests/ExecutionManager/ExecutionManagerTests.cs	Updates version-driven tests to only cover c1.
src/native/managed/cdac/tests/UnitTests/ContractDescriptor/TargetTests.SubDescriptors.cs	Adjusts required-contract filtering to work with the new contract->version map.
src/native/managed/cdac/tests/UnitTests/ContractDescriptor/TargetTests.cs	Switches required-contract list to a name->version dictionary (keeps StressLog at c2).
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Data/StubPrecodeData.cs	Removes StubPrecodeData_1; keeps StubPrecodeData_2 as the sole representation.
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Data/PrecodeMachineDescriptor.cs	Removes older-version-only fields and standardizes on the newer descriptor set.
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/CoreCLRContracts.cs	Registers only the remaining contract versions (c1, plus StressLog c2).
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Contracts/PrecodeStubs_Common.cs	Simplifies the common precode-stubs abstraction by removing the stub-data generic.
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Contracts/PrecodeStubs_1.cs	Moves c1 behavior to the newer precode-type detection + interpreter handling.
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Contracts/PrecodeStubs_2.cs	Deleted (version consolidation).
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Contracts/PrecodeStubs_3.cs	Deleted (version consolidation).
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Contracts/ExecutionManager/Helpers/NibbleMapLinearLookup.cs	Deleted (no longer used after consolidation).
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Contracts/ExecutionManager/Helpers/NibbleMapConstantLookup.cs	Updated comments; remains the nibblemap algorithm used by c1.
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Contracts/ExecutionManager/ExecutionManager_1.cs	Switches c1 to use NibbleMapConstantLookup.
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Contracts/ExecutionManager/ExecutionManager_2.cs	Deleted (version consolidation).
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Contracts/DebugInfo/DebugInfo_1.cs	Consolidates DebugInfo behavior to the newer header/chunk decoding and APIs.
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Contracts/DebugInfo/DebugInfo_2.cs	Deleted (version consolidation).
src/coreclr/vm/datadescriptor/datadescriptor.inc	Updates advertised contract versions to match the new c1 set (StressLog stays c2).
docs/design/datacontracts/PrecodeStubs.md	Updates the authoritative PrecodeStubs spec to the consolidated c1 shape/algorithm.
docs/design/datacontracts/ExecutionManager.md	Updates nibblemap documentation to describe the constant-lookup algorithm as c1.
docs/design/datacontracts/DebugInfo.md	Updates DebugInfo spec to a single c1 description (fat/slim header, vars, async).
docs/design/datacontracts/data-descriptor-overrides.json	Removes now-unneeded suppressions for retired contract versions.
docs/design/datacontracts/data-descriptor-meanings.json	Removes version-qualified phrasing and updates meanings to match consolidated contracts.

Suppressed comments (1)

src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Contracts/PrecodeStubs_1.cs:82

• TryGetKnownPrecodeType returns KnownPrecodeType.DynamicHelper here, but PrecodeStubsCommon.GetPrecodeFromEntryPoint() doesn't handle DynamicHelper (or UMEntry) and will throw InvalidOperationException if GetMethodDescFromStubAddress is called for such a precode. Either implement handling for these precode types in PrecodeStubsCommon (and provide GetMethodDesc behavior), or avoid reporting them as "known" until they are supported.

 else if (precodeMachineDescriptor.DynamicHelperPrecodeType is byte compareByte5 && compareByte5 == exactPrecodeType)
{
return KnownPrecodeType.DynamicHelper;
}

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Pull request overview

Copilot reviewed 16 out of 16 changed files in this pull request and generated no new comments.