[clang] [clang] Enable FPContract with optnone (PR #91061)

[Serge Pavlov via cfe-commits]

================
@@ -968,10 +968,7 @@ class FPOptionsOverride {
       setAllowFPContractAcrossStatement();
   }
 
-  void setDisallowOptimizations() {
-    setFPPreciseEnabled(true);
-    setDisallowFPContract();
-  }
+  void setDisallowOptimizations() { setFPPreciseEnabled(true); }
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spavloff wrote:

Actually this is done by the call to `setFPPreciseEnabled`: https://github.com/spavloff/llvm-project/blob/e518bbfed9eefbe6d9d952dd0354ee974f7a9305/clang/include/clang/Basic/LangOptions.h#L955-L969

https://github.com/llvm/llvm-project/pull/91061