Wasm / R2R: codegen bringup test failures

[AndyAyersMS]

11 tests fail in debug codegen bringup tests, when prejitted for Wasm:

.\build clr+libs -rc debug -c release -os browser
.\src\tests\build skipmanaged browser

;; put repo dotnet, nodejs in path

cd src\tests\Jit\CodeGenBringUpTests

dotnet msbuild /p:TargetArchitecture=wasm /p:TargetOS=browser /p:RuntimeFlavor=coreclr /p:BuildAsStandalone=true JIT.CodeGenBringUpTests_d.csproj

set CORE_ROOT=<REPO_ROOT>\artifacts\tests\coreclr\browser.wasm.debug\Tests\Core_Root
set RunCrossGen2=1

set DOTNET_ReadyToRunExcludeList=JIT.CodeGenBringUpTests_d;XUnitWrapperLibrary;ArrayExc_d;ArrayJagged_d;ArrayObj_d;div2_d;DivConst_d;Localloc_d;ModConst_d;RecursiveTailCall_d;Rotate_d;struct16args_d;StructFldAddr_d

<REPO_ROOT>\artifacts\tests\coreclr\browser.wasm.Debug\JIT\CodeGenBringUpTests\JIT.CodeGenBringUpTests_d\JIT.CodeGenBringUpTests_d.cmd

To repro, remove one of the trailing entries from the DOTNET_ReadyToRunExcludeList above...

[dotnet-policy-service]

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

[AndyAyersMS]

Many of these require EH, so won't work for a while.

• ArrayExc requires handling a bounds check exception
• ArrayJaggedwrite barrier?
• ArrayObj write barrier?
• div2 divide by zero
• DivConst divide by zero
• Localloc null reference exception
• ModConst divide by zero
• RecursiveTailCall
• Rotate -- vm assert (see Wasm / R2R: Type System.DateTime: expected alignment 0x00000004, actual 0x00000008 #128231)
• struct16args -- vm assert (see Wasm / R2R: Type System.DateTime: expected alignment 0x00000004, actual 0x00000008 #128231)
• StructFldAddr -- vm assert (see Wasm / R2R: Type System.DateTime: expected alignment 0x00000004, actual 0x00000008 #128231)

[dotnet-policy-service]

Tagging subscribers to 'arch-wasm': @lewing, @pavelsavara
See info in area-owners.md if you want to be subscribed.

[AndyAyersMS]

With the _r variants I also get failures with three more tests. These all seem to require EH as well.

• CastThenBinop
• UDivConst_r
• UModConst_r