[clang] [clang] Implement CWG2851: floating-point conversions in converted constant expressions (PR #90387)

[via cfe-commits]

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@@ -6229,7 +6231,37 @@ static ExprResult BuildConvertedConstantExpression(Sema 
&S, Expr *From,
   if (Result.isInvalid())
     return Result;
 
-  // Check for a narrowing implicit conversion.
+  if (SCS->Second == ICK_Floating_Conversion) {
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Sirraide wrote:

‘all of this’ being everything you added here

https://github.com/llvm/llvm-project/pull/90387
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