[clang] [Clang] Fix the mangling of lambdas (PR #89204)

[Aaron Ballman via cfe-commits]

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+// RUN: %clang_cc1 -triple x86_64-linux-gnu %s -emit-llvm -o - | FileCheck %s
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AaronBallman wrote:

Do you know if we're doing the correct thing for Microsoft mangling in this case? (Do we have test coverage for that? Maybe add some tests as a follow-up PR?)

https://github.com/llvm/llvm-project/pull/89204