[clang] Reland [Driver] Add support for GCC installation detection in Baremetal toolchain (PR #145390)

[Garvit Gupta via cfe-commits]

quic-garvgupt wrote:

Hi @mysterymath, could you please initiate a build for this PR (#145390) along with PR #144649 on the Fuchsia buildbot? These two PRs contain the necessary fixes to resolve the failure previously encountered on the [fuchsia buildbots](https://luci-milo.appspot.com/ui/p/fuchsia/builders/toolchain.ci/clang-linux-x64/b8711783358287375697/overview) , which led to their reversion in PR #144603.

Triggering a force build will help verify that the fix is effective and does not cause any further buildbot failures. Please ensure that PR #145390 and PR #144649 are applied in sequence to avoid any merge conflicts

https://github.com/llvm/llvm-project/pull/145390