[DirectX] Add isinf f16 emulation for SM6.8 and lower (#156932) fixes #156068 - We needed to add a new sub arch to the target tripple so we can test that emulation does not happen when targeting SM6.9 - The HLSL toolchain needed to be updated to handle the conversion of strings to enums for the new sub arch. - The emulation is done in DXILIntrinsicExpansion.cpp and needs to be able to convert both llvm.is.fpclass and lvm.dx.isinf to the proper emulation - test updates in TargetParser/TripleTest.cpp, isinf.ll, is_fpclass.ll, and DXCModeTest.cpp
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