[clang] [clang] Fix a use-after-free in expression evaluation (PR #118480)

[kadir çetinkaya via cfe-commits]

kadircet wrote:

> ping, is this still a problem?

yes, this is still happening. but I am currently lacking cycles to dig deeper into expression evaluation to see if this is the right fix given the reproducer. @VitaNuo was to take a look with some limited capacity, but I think she's also in a similar situation as me :D. If anyone wants to take over/help, feel free to do so. But I'll wait for an update from @VitaNuo, in case she already made progress here.

https://github.com/llvm/llvm-project/pull/118480