[clang] [Driver] Add support for crtbegin.o, crtend.o and libgloss lib to BareMetal toolchain object (PR #121830)

[Petr Hosek via cfe-commits]

petrhosek wrote:

> The answer is yes, this builder does set a different unwindlib.

That shouldn't have any effect on tests, if it does, it likely implies an issue with the test.

https://github.com/llvm/llvm-project/pull/121830