[llvm] Revert "Reduce llvm-gsymutil memory usage" (PR #140696)

[Danila Malyutin via llvm-commits]

danilaml wrote:

@sfc-gh-sgiesecke there was this https://github.com/llvm/llvm-project/pull/140740 but then it got reverted again in https://github.com/llvm/llvm-project/pull/142829

https://github.com/llvm/llvm-project/pull/140696