Generate SslConnectionInfo.Unix.cs with T4 template

[am11]

Instead of generating a huge static dictionary and runtime lookup, we can directly generate a switch-case chain.

System_Net_Security_System_Net_Security_TlsCipherSuiteData___cctor is the largest method in terms of code size.

This PR removes the cctor and inlines the value assignment. It shaves off 18.3 K from the final NativeAOT published binary.

# on osx-arm64# prereqs## $ dotnet tool install -g dotnet-t4 -a arm64## $ cd runtime## $ t4 src/libraries/System.Net.Security/src/System/Net/Security/SslConnectionInfo.Unix.tt -o src/libraries/System.Net.Security/src/System/Net/Security/SslConnectionInfo.Unix.cs# build required subsets to publish CG2 with map file
$ ./build.sh clr+libs+packs -c Release -p:IlcGenerateMapFile=true
# top 50 largest methods
$ xmlstarlet sel -t -m "//ObjectNodes/MethodCode" -v 'concat(@Length, ": ", @Name)' -n artifacts/obj/coreclr/crossgen2/arm64/Release/native/crossgen2.map.xml | sort -nr | head -50

[ghost]

Tagging subscribers to this area: @dotnet/ncl, @bartonjs, @vcsjones
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Issue Details

---

Instead of generating a huge static dictionary and runtime lookup, we can directly generate a switch-case chain.

System_Net_Security_System_Net_Security_TlsCipherSuiteData___cctor is the largest method in terms of code size.

This PR removes the cctor and inlines the value assignment. It shaves off 18.3 K from the final NativeAOT published binary.

# on osx-arm64# prereqs## $ dotnet tool install -g dotnet-t4 -a arm64## $ cd runtime## $ t4 src/libraries/System.Net.Security/src/System/Net/Security/SslConnectionInfo.Unix.tt -o src/libraries/System.Net.Security/src/System/Net/Security/SslConnectionInfo.Unix.cs# build required subsets to publish CG2 with map file
$ ./build.sh clr+libs+packs -c Release -p:IlcGenerateMapFile=true
# top 50 largest methods
$ xmlstarlet sel -t -m "//ObjectNodes/MethodCode" -v 'concat(@Length, ": ", @Name)' -n artifacts/obj/coreclr/crossgen2/arm64/Release/native/crossgen2.map.xml | sort -nr | head -50

Author:	am11
Assignees:	-
Labels:	area-System.Net.Security, community-contribution
Milestone:	-

[ghost]

Tagging subscribers to 'size-reduction': @eerhardt, @SamMonoRT, @marek-safar
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Instead of generating a huge static dictionary and runtime lookup, we can directly generate a switch-case chain.

System_Net_Security_System_Net_Security_TlsCipherSuiteData___cctor is the largest method in terms of code size.

This PR removes the cctor and inlines the value assignment. It shaves off 18.3 K from the final NativeAOT published binary.

# on osx-arm64# prereqs## $ dotnet tool install -g dotnet-t4 -a arm64## $ cd runtime## $ t4 src/libraries/System.Net.Security/src/System/Net/Security/SslConnectionInfo.Unix.tt -o src/libraries/System.Net.Security/src/System/Net/Security/SslConnectionInfo.Unix.cs# build required subsets to publish CG2 with map file
$ ./build.sh clr+libs+packs -c Release -p:IlcGenerateMapFile=true
# top 50 largest methods
$ xmlstarlet sel -t -m "//ObjectNodes/MethodCode" -v 'concat(@Length, ": ", @Name)' -n artifacts/obj/coreclr/crossgen2/arm64/Release/native/crossgen2.map.xml | sort -nr | head -50

Author:	am11
Assignees:	-
Labels:	area-System.Net.Security, size-reduction, community-contribution
Milestone:	-

[rzikm]

LGTM from System.Net.Security perspective.

Does it improve the size of regular System.Net.Security.dll binary as well?

Would prefer to have jkotas to have a look on this PR before merging.

[SamMonoRT]

cc @ivanpovazan

[jkotas]

Looks great otherwise - thank you!

[jkotas]

enterprise-linux failure is #84795