[clang] [clang][PowerPC] Add flag to enable compatibility with GNU for complex arguments (PR #77732)

[via cfe-commits]

UmeshKalappa0 wrote:

@diggerlin  ,
>>can we implement -fcomplex-ppc-gnu-abi as "-msoft-float" ? what is your opinion ?
that was  not the intent here and we need to consultant ABI reference regrading the same ,before we decide on implementation .

https://github.com/llvm/llvm-project/pull/77732