[llvm] [LLVM][IR] Add textual shorthand for specifying constant vector splats. (PR #74620)

[Paul Walker via llvm-commits]

================
@@ -5824,6 +5839,17 @@ bool LLParser::convertValIDToValue(Type *Ty, ValID &ID, Value *&V,
                                "' but expected '" + getTypeString(Ty) + "'");
     V = ID.ConstantVal;
     return false;
+  case ValID::t_ConstantSplat:
+    if (!Ty->isVectorTy())
+      return error(ID.Loc, "vector constant must have vector type");
----------------
paulwalker-arm wrote:

Sure, I'll add them.  If more existed I would not have made my original mistake :)

https://github.com/llvm/llvm-project/pull/74620