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

[Erich Keane via cfe-commits]

================
@@ -38,3 +38,25 @@ mlir::Value CIRGenBuilderTy::getArrayElement(mlir::Location arrayLocBegin,
   const mlir::Type flatPtrTy = basePtr.getType();
   return create<cir::PtrStrideOp>(arrayLocEnd, flatPtrTy, basePtr, idx);
 }
+
+cir::ConstantOp CIRGenBuilderTy::getConstInt(mlir::Location loc,
+                                             llvm::APSInt intVal) {
+  bool isSigned = intVal.isSigned();
+  unsigned width = intVal.getBitWidth();
+  cir::IntType t = isSigned ? getSIntNTy(width) : getUIntNTy(width);
+  return getConstInt(loc, t,
+                     isSigned ? intVal.getSExtValue() : intVal.getZExtValue());
+}
+
+cir::ConstantOp CIRGenBuilderTy::getConstInt(mlir::Location loc,
+                                             llvm::APInt intVal) {
+  unsigned width = intVal.getBitWidth();
----------------
erichkeane wrote:

```suggestion
  return getConstInt(loc, llvm::APSInt(intVal));
```

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