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

[zhijian lin via cfe-commits]

diggerlin 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 .

I think I do not express comment clearly, My comment is that "can we implement ` -fcomplex-ppc-gnu-abi` in llc  ? ,  as  `-msoft-float` which was implemented in the llc .

I went through the code  which implement of the `-msoft-float` today , I am OK to implement   ` -fcomplex-ppc-gnu-abi` as it is.


I do not have comment on the PR, I approved it, but please wait other several days to see whether there is other comment from other reviewer before you merge.


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