[clang] [Clang] Track alloca element types to avoid getAllocatedType() calls (PR #181740)

[Jameson Nash via cfe-commits]

vtjnash wrote:

Yep, I just followed up on that too in https://github.com/llvm/llvm-project/pull/185550 (it is a separate fix from this PR)

https://github.com/llvm/llvm-project/pull/181740