[clang] [CIR] Record -ffp-contract=fast as a per-op contract flag (PR #226334)

[David Rivera via cfe-commits]

================
@@ -1468,6 +1483,8 @@ CIRGenFunction::CIRGenFPOptionsRAII::~CIRGenFPOptionsRAII() {
   cgf.curFPFeatures = oldFPFeatures;
   cgf.builder.setDefaultConstrainedExcept(oldExcept);
   cgf.builder.setDefaultConstrainedRounding(oldRounding);
+  if (restoredFastMathFlags)
+    cgf.builder.setFastMathFlags(oldFastMathFlags);
----------------
RiverDave wrote:

Great suggestion, I've added these on: clang/test/CIR/CodeGen/fp-contract.c

https://github.com/llvm/llvm-project/pull/226334