[HLSL][SPIRV] __builtin_hlsl_elementwise_isinf should generate OpIsInf

[spall]

'__builtin_hlsl_elementwise_isinf' currently always generates the 'llvm.dx.isinf' intrinsic (

llvm-project/clang/lib/CodeGen/CGHLSLBuiltins.cpp

Line 551 in 00dd666

return Builder.CreateIntrinsic(retType, Intrinsic::dx_isinf,

)

This makes its way to the SPIRV Backend and produces this crash:
https://godbolt.org/z/Me1r6Es7x

In the case of spirv we need to generate a spirv intrinsic instead.
SPIRV Op: OpIsInf

[llvmbot]

@llvm/issue-subscribers-clang-codegen

Author: Sarah Spall (spall)

'__builtin_hlsl_elementwise_isinf' currently always generates the 'llvm.dx.isinf' intrinsic (https://github.com/llvm/llvm-project/blob/00dd6660c2bfdb024159aa9a0a69a29cdffe1a64/clang/lib/CodeGen/CGHLSLBuiltins.cpp#L551)

This makes its way to the SPIRV Backend and produces this crash:
https://godbolt.org/z/Me1r6Es7x

In the case of spirv we need to generate a spirv intrinsic instead.
SPIRV Op: OpIsInf