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

[Sam Elliott via cfe-commits]

lenary wrote:

@kewen12 I think I can see how to fix these tests, I'm just confused because these tests seem to end up requesting both compiler-rt and libgcc. Is that bot configured with a different default unwindlib to normal or something?

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