Reinstate getSplat(unsigned NumElts, Constant *V)

Reinstate getSplat(unsigned NumElts, Constant *V) to
avoid build errors in the front-end.

When the front-end switches fully to
getSplat(ElementCount EC, Constant *V) then the
deprecated version will be removed.

Change-Id: I8af69698a9be0d45a255759e50d2d2444e570874

Author: piotrAMD

llvm/include/llvm/IR/Constants.h

@@ -519,6 +519,9 @@ class ConstantVector final : public ConstantAggregate {
   /// Return a ConstantVector with the specified constant in each element.
   static Constant *getSplat(ElementCount EC, Constant *Elt);
 
+  /// \deprecated { Return a ConstantVector with the specified constant in each element. }
+  static Constant *getSplat(unsigned NumElts, Constant *Elt);
+
   /// Specialize the getType() method to always return a VectorType,
   /// which reduces the amount of casting needed in parts of the compiler.
   inline VectorType *getType() const {

llvm/lib/IR/Constants.cpp

@@ -1235,6 +1235,17 @@ Constant *ConstantVector::getSplat(ElementCount EC, Constant *V) {
   return ConstantExpr::getShuffleVector(V, UndefV, Zeros);
 }
 
+Constant *ConstantVector::getSplat(unsigned NumElts, Constant *V) {
+  // If this splat is compatible with ConstantDataVector, use it instead of
+  // ConstantVector.
+  if ((isa<ConstantFP>(V) || isa<ConstantInt>(V)) &&
+      ConstantDataSequential::isElementTypeCompatible(V->getType()))
+    return ConstantDataVector::getSplat(NumElts, V);
+
+  SmallVector<Constant*, 32> Elts(NumElts, V);
+  return get(Elts);
+}
+
 ConstantTokenNone *ConstantTokenNone::get(LLVMContext &Context) {
   LLVMContextImpl *pImpl = Context.pImpl;
   if (!pImpl->TheNoneToken)