[llvm] Revert "[DTLTO] Speed up temporary file removal in the ThinLTO backed (PR #189043)

[Ben Dunbobbin via llvm-commits]

bd1976bris wrote:

The sanitizer failures happened for `lld/test/ELF/dtlto/timetrace.test` so @vitalybuka commented on the PR that introduced that test: https://github.com/llvm/llvm-project/pull/175799#issuecomment-4123875915. However, the test is just exposing the issue. The change that caused the problem was introduced in: https://github.com/llvm/llvm-project/pull/186988. I can't see a simple fix so I'm reverting the change.

https://github.com/llvm/llvm-project/pull/189043