[clang] [clang] Stop adjusting the module cache path (PR #102540)

[Alexandre Ganea via cfe-commits]

aganea wrote:

> This enables more efficient implementation of the caching VFS in #88800.

Thanks @jansvoboda11 for working on this, I appreciate. One question, what do you mean by "more efficient"?

https://github.com/llvm/llvm-project/pull/102540