[clang] [clang][Driver] Define soft float macros for PPC. (PR #106012)

[Chen Zheng via cfe-commits]

================
@@ -439,14 +443,12 @@ void PPCTargetInfo::getTargetDefines(const LangOptions &Opts,
   // FIXME: The following are not yet generated here by Clang, but are
   //        generated by GCC:
   //
-  //   _SOFT_FLOAT_
   //   __RECIP_PRECISION__
   //   __APPLE_ALTIVEC__
   //   __RECIP__
   //   __RECIPF__
   //   __RSQRTE__
   //   __RSQRTEF__
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chenzheng1030 wrote:

Would you please also handle `__RSQRTE__` and `__RSQRTEF__`? These two macros should also be impacted by soft-float. Thanks.

https://github.com/llvm/llvm-project/pull/106012