3a1d5b5b8c
Which is under discussion in https://github.com/llvm/llvm-project/issues/179036. x86-64 support is added in https://github.com/llvm/llvm-project/pull/180242. Now add x86-32 support for reserving EDI via `-ffixed-edi` Update the X86 backend to respect those reservations in register handling, callee-save logic, and memcpy/memset lowering, and add driver/codegen tests. Add clang driver support for -ffixed-edi and map it to the reserve-edi target feature on i386. Teach the X86 backend to treat EDI as a user-reserved register in register lookup, reserved-register tracking, and callee-save handling, and avoid selecting REP MOVS/REP STOS when EDI is reserved. Add driver, Sema, and codegen tests covering option handling, named global register variables, and the resulting code generation changes. Signed-off-by: ZhouGuangyuan <zhouguangyuan.xian@gmail.com>
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