[clang] [CIR] Infrastructure: class CIRGenBuilderTy; cache CIR types (PR #119037)

[Nathan Lanza via cfe-commits]

================
@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CIR_CIRGENBUILDER_H
+#define LLVM_CLANG_LIB_CIR_CIRGENBUILDER_H
----------------
lanza wrote:

Similar, missing `CODEGEN`.

https://github.com/llvm/llvm-project/pull/119037