Mingming Liu 9879e5865a [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

2023-04-26 09:18:41 -07:00

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