[clang] [clang] Use constant rounding mode for floating literals (PR #90877)

[Erich Keane via cfe-commits]

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@@ -3858,7 +3858,8 @@ static Expr *BuildFloatingLiteral(Sema &S, NumericLiteralParser &Literal,
   using llvm::APFloat;
   APFloat Val(Format);
 
-  APFloat::opStatus result = Literal.GetFloatValue(Val);
+  APFloat::opStatus result =
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erichkeane wrote:

Does this work right in templates?  Can we get a test that validates that a NTTP or Dependent value where the rounding mode is set either around or inside the function does the math right?

https://github.com/llvm/llvm-project/pull/90877