[clang] [Clang][CodeGen] Use EmitLoadOfLValue instead of EmitLoadOfScalar to get LHS for complex compound assignment (PR #166798)

[Eli Friedman via cfe-commits]

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+// Reduced from https://github.com/llvm/llvm-project/issues/166512
+// RUN: %clang_cc1 %s -emit-obj -std=c23 -fsanitize=bool -o %t
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efriedma-quic wrote:

I'd prefer to have a test that actually checks that we generate correct code, not just that we generate code without crashing.

update_cc_test_checks.py is an easy way to write checks.

https://github.com/llvm/llvm-project/pull/166798