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[AMDGPU] Update DWARF proposal
- Unify the sections on DWARF expression and location lists. - Allow a location description to have one or more single location descriptions. - Define context of DWARF expression that includes an initial stack. Allow initial stack to be used when evaluating location list expression with overlapping PC ranges. - Reorganize the DWARF proposal in AMDGPUUsage so suitable for submission to the DWARF site. - Replace CFI instruction DW_CFA_LLVM_def_cfa_aspace with DW_CFA_def_aspace_cfa and DW_CFA_def_aspace_cfa_sf. This is to avoid the problem that DW_CFA_def_cfa and DW_CFA_def_cfa_sf cannot use a register that is not the size of an address in the CFA address space. - Clarify DWARF address class and DWARF address space. Define language values for DWARF address classes and specify how they are used by some common source languages. - Define rules for accessing registers and derefencing memory when the type size and register size or byte size operand do not match. - Numerous cleanups for consistency. Differential Revision: https://reviews.llvm.org/D70523
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