Optimize typeof(T).IsValueType

[EgorBo]

Fixes https://github.com/dotnet/coreclr/issues/23208
Also, contributes to https://github.com/dotnet/coreclr/issues/2591
Also, dotnet/aspnetcore@a42fff6

Replaces patterns like typeof(T).IsValueType or var.GetType().IsValueType() with constants (true/false).
E.g.:

classCase1{publicboolFoo<T>()=>typeof(T).IsValueType;publicboolTest1()=>Foo<int>();publicboolTest2()=>Foo<string>();}

Current codegen:

; Method Case1:Test1():bool:thisG_M15309_IG01:subrsp,40G_M15309_IG02:movrcx,0xD1FFAB1Ecall CORINFO_HELP_TYPEHANDLE_TO_RUNTIMETYPEmovrcx,raxmovrax, qword ptr [(reloc)]cmp dword ptr [rcx],ecxG_M15309_IG03:addrsp,40 rex.jmprax; Total bytes of code: 38; Method Case1:Test2():bool:thisG_M7114_IG01:subrsp,40G_M7114_IG02:movrcx,0xD1FFAB1Ecall CORINFO_HELP_TYPEHANDLE_TO_RUNTIMETYPEmovrcx,raxmovrax, qword ptr [(reloc)]cmp dword ptr [rcx],ecxG_M7114_IG03:addrsp,40 rex.jmprax; Total bytes of code: 38

New codegen:

; Method Case1:Test1():bool:thisG_M15308_IG02:moveax,1G_M15308_IG03:ret; Total bytes of code: 6; Method Case1:Test2():bool:thisG_M7113_IG02:xoreax,eaxG_M7113_IG03:ret; Total bytes of code: 3

This PR also implements Type.IsPrimitive and Type.IsClass. Probably can implement more for free, e.g. Type.IsArray and Type.IsEnum (this one is virtual)

[EgorBo]

I find the following tests quite weird (matching current behaviour):

IsTrue(typeof(int*).IsClass)
IsTrue (typeof(Action<int>).IsClass);IsFalse(typeof(ValueType).IsValueType);IsTrue(typeof(ValueType).IsClass);<removed>

[jkotas]

I find the following tests quite weird (matching current behaviour):

I believe that's because of the tests have a few copy&paste bugs.

[jkotas]

LGTM. Thank you!

I would like somebody from the JIT team to sign-off on this as well before merging.

[AndyAyersMS]

LGTM too. Thanks.