[compiler-rt] [llvm] Revert "[runtimes] Allow building against an installed LLVM tree" (PR #113920)

[Kirill Stoimenov via llvm-commits]

kstoimenov wrote:

Looks like this break the QEMU Sanitizer build: https://lab.llvm.org/buildbot/#/builders/139/builds/5496/steps/30/logs/stdio

https://github.com/llvm/llvm-project/pull/113920