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

[zhijian lin via cfe-commits]

================
@@ -271,22 +271,32 @@ namespace {
 class PPC32_SVR4_ABIInfo : public DefaultABIInfo {
   bool IsSoftFloatABI;
   bool IsRetSmallStructInRegABI;
+  bool IsComplexInRegABI;
+  // Size of GPR in bits.
+  static const unsigned RegLen = 32;
+  static const int NumArgGPRs = 8;
----------------
diggerlin wrote:

change to `ArgGPRsNum` ?

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