[clang] [CIR] Upstream minimal builtin function call support (PR #142981)

[Erich Keane via cfe-commits]

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@@ -201,6 +201,19 @@ class CIRGenBuilderTy : public cir::CIRBaseBuilderTy {
   cir::IntType getUInt32Ty() { return typeCache.UInt32Ty; }
   cir::IntType getUInt64Ty() { return typeCache.UInt64Ty; }
 
+  cir::ConstantOp getConstInt(mlir::Location loc, llvm::APSInt intVal);
+
+  cir::ConstantOp getConstInt(mlir::Location loc, llvm::APInt intVal);
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erichkeane wrote:

Actually, we probably only have to handle `APSInt`.  It has an (explicit) ctor from `APInt`.  Wonder if we should just implement one in terms of the other.

https://github.com/llvm/llvm-project/pull/142981