[clang] [Clang][Sema] fix crash in codegen stage when an lambda expression declared in an unevaluated context (PR #80802)

[Mariya Podchishchaeva via cfe-commits]

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+// RUN: %clang_cc1 -verify -std=c++20 -emit-llvm -o - %s
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Fznamznon wrote:

I wonder if `-verify` flag is necessary? There is no diagnostics expected, and the test makes sure LLVM IR generation doesn't crash even without `-verify` flag.

https://github.com/llvm/llvm-project/pull/80802