[clang] Remove rest TargetOptions::UnsafeFPMath use (llvm#164525)

This should be the last use in clang.

Author: paperchalice

clang/lib/CodeGen/BackendUtil.cpp

@@ -430,12 +430,6 @@ static bool initTargetOptions(const CompilerInstance &CI,
   Options.NoInfsFPMath = LangOpts.NoHonorInfs;
   Options.NoNaNsFPMath = LangOpts.NoHonorNaNs;
   Options.NoZerosInBSS = CodeGenOpts.NoZeroInitializedInBSS;
-  Options.UnsafeFPMath = LangOpts.AllowFPReassoc && LangOpts.AllowRecip &&
-                         LangOpts.NoSignedZero && LangOpts.ApproxFunc &&
-                         (LangOpts.getDefaultFPContractMode() ==
-                              LangOptions::FPModeKind::FPM_Fast ||
-                          LangOpts.getDefaultFPContractMode() ==
-                              LangOptions::FPModeKind::FPM_FastHonorPragmas);
 
   Options.BBAddrMap = CodeGenOpts.BBAddrMap;
   Options.BBSections =