[clang] [analyzer] Ignoring `T v=v; ` idiom for uninitialized variable checker and dead store checker (PR #187530)

[Balázs Benics via cfe-commits]

https://github.com/steakhal commented:

Looks great! Thank you for the ping.
I only had minor nits with clickable suggestions inline.

https://github.com/llvm/llvm-project/pull/187530