[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:

My plan is to modify the tests to accept that there might be unwindlib arguments between `clang_rt.builtins.a` and `-lc`, which is where the breakage is right now.

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