[clang] [clang][analyzer][NFC] Improve Clang Static Analyzer performance. (PR #138295)

[Balazs Benics via cfe-commits]

steakhal wrote:

FYI, build bots suggests that this PR has build errors.

BTW, could you run this under perf stats to demonstrate the reduction of the cache-misses and page-faults? I'd suspect a measurable difference if these separate allocators really help.

https://github.com/llvm/llvm-project/pull/138295