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

[Nemanja Ivanovic via cfe-commits]

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@@ -2540,6 +2540,10 @@ def ffp_contract : Joined<["-"], "ffp-contract=">, Group<f_Group>,
   HelpText<"Form fused FP ops (e.g. FMAs)">,
   Values<"fast,on,off,fast-honor-pragmas">;
 
+def fcomplex_ppc_gnu_abi : Flag<["-"], "fcomplex-ppc-gnu-abi">, Group<f_Group>, Visibility<[ClangOption, CC1Option]>,
+  DocBrief<"Follow the GNU ABI, store Complex values in GPR instead of stack for PowerPC-32">,
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nemanjai wrote:

Please use "Pass" instead of "Store" as the latter generally refers to storing values in memory and this actually affects parameter passing.

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