[clang] [CIR] Implement Statement Expressions (PR #153677)

[Andy Kaylor via cfe-commits]

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+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fclangir -emit-cir %s -o %t.cir
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andykaylor wrote:

Can you add a test that requires a cleanup related to the scope of the statement expression?

In the incubator, I see `stmt-expr.c`, `stmt-expr.cpp`, and `stmtexpr-init.c`. I'm not sure if we have enough support for everything included in these tests, but they have some interesting cases, including a commented out test for a statement containing a label that you've added support for.

https://github.com/llvm/llvm-project/pull/153677