[clang] [mlir] [CIR] Add CIRABIRewriteContext for ABI function/call rewriting (PR #192119)

[Andy Kaylor via cfe-commits]

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+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Unit tests for CIRABIRewriteContext, the CIR dialect's concrete
+// implementation of the shared ABIRewriteContext interface.  Each test
+// constructs a FunctionClassification manually (no ABI library needed)
+// and verifies the resulting IR after rewriting.
+//
+//===----------------------------------------------------------------------===//
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andykaylor wrote:

Do you have tests here for coercion that goes through memory?

https://github.com/llvm/llvm-project/pull/192119