[clang] [CLANG] Full support of complex multiplication and division. (PR #81514)

[Joshua Cranmer via cfe-commits]

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@@ -310,6 +310,13 @@ class ComplexExprEmitter
         CGF.getContext().getFloatTypeSemantics(ElementType);
     const llvm::fltSemantics &HigherElementTypeSemantics =
         CGF.getContext().getFloatTypeSemantics(HigherElementType);
+    // Check that LongDouble Size > Double Size.
+    // This can be interpreted as:
+    // SmallerType.LargestFiniteVal * SmallerType.LargestFiniteVal <=
+    // LargerType.LargestFiniteVal.
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jcranmer-intel wrote:

Not entirely accurate, it's `(SmallerType.LargestFiniteVal * SmallerType.LargestFiniteVal) * 2`

https://github.com/llvm/llvm-project/pull/81514