[AMDGPU] Emit entry function Dwarf CFI#164722

slinder1 wants to merge 4 commits intousers/slinder1/11-04-_clang_default_to_async_unwind_tables_for_amdgcnllvm/llvm-project:users/slinder1/11-04-_clang_default_to_async_unwind_tables_for_amdgcnfrom

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