[clang] [clang][test] Rebuild lld if the clang driver tests will use it (PR #174512)

[Sean Perry via cfe-commits]

perry-ca wrote:

Looks good.  Thinking along the lines that Cyndy is, should the support for lld/lto be captured in a resource so we can clean up the `REQUIRE:`/`UNSUPPORTED:` lines in the test cases?

https://github.com/llvm/llvm-project/pull/174512