[clang] [llvm] [LLVM][IR] Add native vector support to ConstantInt & ConstantFP. (PR #74502)

[Paul Walker via cfe-commits]

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@@ -98,6 +99,13 @@ class ConstantInt final : public ConstantData {
   /// value. Otherwise return a ConstantInt for the given value.
   static Constant *get(Type *Ty, uint64_t V, bool IsSigned = false);
 
+  /// WARNING: Incomplete support, do not use. These methods exist for early
+  /// prototyping, for most use cases ConstantInt::get() should be used.
+  /// Return a ConstantInt with a splat of the given value.
+  static ConstantInt *getSplat(LLVMContext &Context, ElementCount EC,
+                               const APInt &V);
+  static ConstantInt *getSplat(const VectorType *Ty, const APInt &V);
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paulwalker-arm wrote:

We're in a transition period and thus I need an absolute way to create a vector ConstantInt (e.g. when parsing ll files and bitcode). Today `ConstantInt::get()` returns other `Constant` types to represent splats and that must be maintained for correctness because there are many code paths for which a vector ConstantInt will break.

https://github.com/llvm/llvm-project/pull/74502