[mono][llvm] Support exception filters

[imhameed]

Seen in https://github.com/dotnet/runtime/blob/6474c725025a8b29b4265c4d9485018982ee6b16/src/tests/JIT/HardwareIntrinsics/X86/Sse42.X64/Crc32.cs. Makes Mono bail out of translating to LLVM with "LLVM failed for 'Program.Main': non-finally/catch/fault clause."

The resulting test then ends up with weird semi-consistent codegen which causes it to print:

Intrinsic Sse42.X64.Crc32 is called on non-supported hardware.
Sse42.IsSupported False
Environment.Is64BitProcess True
Intrinsic Sse42.X64.Crc32 is called via reflection on non-supported hardware.
Sse42.IsSupported False
Environment.Is64BitProcess True

but still yield 0 (instead of 100) as an exit code.

Random notes:

https://llvm.org/docs/LangRef.html#llvm-localescape-and-llvm-localrecover-intrinsics
https://github.com/dotnet/llvm-project/blob/release/11.x/llvm/test/CodeGen/X86/wineh-coreclr.ll

One difficulty with llvm.localaddress and llvm.localrecover is that they are currently only supported on x86, x86-64, and aarch64. But it doesn't look like it'd be too hard to add support for other platforms. (But I have no idea how involved this would be for WASM)

Also enable JIT/HardwareIntrinsics/X86/Sse42.X64/Crc32_{r,ro} test with the fix

[SamMonoRT]

@BrzVlad - any overlap between work done on exception filters from issues in your queue ?

[BrzVlad]

Supporting exception filters with llvm requires some research, unrelated with any other work. We never supported exception filters with llvm. Doesn't seem feasible for .NET 6.0

[SamMonoRT]

Moving this to Future milestone.

[kasperk81]

@jandupej #54176 is closed but referenced in

runtime/src/tests/issues.targets

Lines 1207 to 1212 in f020861

	<ExcludeList Include = "$(XunitTestBinBase)/JIT/HardwareIntrinsics/X86/Sse2.X64/StoreNonTemporal_r/**">
	<Issue>https://github.com/dotnet/runtime/issues/54176</Issue>
	</ExcludeList>
	<ExcludeList Include = "$(XunitTestBinBase)/JIT/HardwareIntrinsics/X86/Sse2.X64/StoreNonTemporal_ro/**">
	<Issue>https://github.com/dotnet/runtime/issues/54176</Issue>
	</ExcludeList>

and

runtime/src/tests/JIT/HardwareIntrinsics/X86/Sse2.X64/StoreNonTemporal.cs

Line 19 in f020861

[ActiveIssue("https://github.com/dotnet/runtime/issues/54176", TestRuntimes.Mono)]

will it be fixed somewhat differently? otherwise replace the link with reason strings similar to other unsupported tests: non-temporal store intrinsics are not supported on this platform.

[jandupej]

@kasperk81 The reason for disabling the test you indicate is strange. I created an issue where enabling these tests can be tracked: #93202