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[InlineAsm][AArch64]Add backend support for flag output parameters
- The set of flag is from https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Flag-Output-Operands Before: - ARM64 GCC supports flag output constraints, while Clang doesn't parse condition code, as shown in https://gcc.godbolt.org/z/7jzMEK796 - LLVM ISel won't lower them either (as shown in https://gcc.godbolt.org/z/Pv4PPf56c) After: - Given flag output constraints in LLVM IR, condition code is parsed and flag output is lowered to 'cset'. - Clang parse is not added in this patch. Differential Revision: https://reviews.llvm.org/D149032
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