[llvm] Add IRBuilder::CreateFMA (PR #131112)

[Matt Arsenault via llvm-commits]

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@@ -1065,6 +1065,13 @@ class IRBuilderBase {
                            {Src, Exp}, FMFSource, Name);
   }
 
+  /// Create call to the fma intrinsic.
+  Value *CreateFMA(Value *Factor1, Value *Factor2, Value *Summand,
+                   FMFSource FMFSource = {}, const Twine &Name = "") {
+    return CreateIntrinsic(Intrinsic::fma, {Factor1->getType()},
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arsenm wrote:

Handling constrained FMA is easy because constrained_fma already exists. The problem for ldexp is the constraint intrinsic does not yet exist 

https://github.com/llvm/llvm-project/pull/131112