[clang] [llvm] [mlir] [LLVM][Constants] Store "splat (float 0.0)" as ConstantFP rather than ConstantAggregateZero. (PR #195284)

[Matt Arsenault via cfe-commits]

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@@ -1672,6 +1672,11 @@ static void writeConstantInternal(raw_ostream &Out, const Constant *CV,
     Type *Ty = CFP->getType();
 
     if (Ty->isVectorTy()) {
+      if (CFP->isNullValue()) {
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arsenm wrote:

Probably should avoid using isNullValue when you know the concrete value class, isNullValue is dispatching over all the kinds of constants 

https://github.com/llvm/llvm-project/pull/195284