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

[Andy Kaylor via cfe-commits]

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@@ -51,10 +51,20 @@ CIRGenFunction::CIRGenFunction(CIRGenModule &cgm, CIRGenBuilderTy &builder,
   ehStack.setCGF(this);
   shouldEmitLifetimeMarkers = CodeGenUtils::shouldEmitLifetimeMarkers(
       cgm.getCodeGenOpts(), getContext().getLangOpts());
+  setFastMathFlags(curFPFeatures);
 }
 
 CIRGenFunction::~CIRGenFunction() {}
 
+void CIRGenFunction::setFastMathFlags(FPOptions fpFeatures) {
+  // TODO(cir): set the remaining fast-math flags.
+  assert(!cir::MissingFeatures::fastMathFlags());
+  cir::FastMathFlags flags = cir::FastMathFlags::none;
+  if (fpFeatures.allowFPContractAcrossStatement())
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andykaylor wrote:

No worries. I appreciate that you've implemented it now.

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