[PATCH] D151806: [AsmPrinter][AMDGPU] Generate uwtable entries in .eh_frame

[Juan Manuel Martinez Caamaño via Phabricator via llvm-commits]

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Consider only targets where `MCAsmInfo::ExceptionsType == ExceptionHandling::None`
and that support CFI (when `MCAsmInfo::UsesCFIForDebug` is set to true):
currently, only AMDGPU.

This patch enables the emission of CFI information in the .eh_frame
section when the uwtable attribute is present on a function.

Before, we could generate CFI information for debugging puproses only.

This patch prepares AMDGPU to support collecting GPU stack traces in the future.

I did a first implementation (https://reviews.llvm.org/D139024)
but at the time I had not realized that no other platform used
`UsesCFIForDebug`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D151806

Files:
  llvm/include/llvm/CodeGen/AsmPrinter.h
  llvm/include/llvm/MC/MCAsmInfo.h
  llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  llvm/lib/CodeGen/AsmPrinter/DwarfCFIException.cpp
  llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUMCAsmInfo.cpp
  llvm/test/CodeGen/AMDGPU/eh_frame.ll
  llvm/test/tools/UpdateTestChecks/update_llc_test_checks/Inputs/amdgpu_generated_funcs.ll.generated.expected
  llvm/test/tools/UpdateTestChecks/update_llc_test_checks/Inputs/amdgpu_generated_funcs.ll.nogenerated.expected

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