rfe: clang doesn't select the linker suitable for target

[stsp]

When clang is passed, say,
-target aarch64-unknown-linux-gnu -fuse-ld=bfd
it doesn't invoke aarch64-unknown-linux-gnu-ld
but just ld.bfd.
I wonder if it is intentional, or just a not implemented
feature?

[llvmbot]

@llvm/issue-subscribers-clang-driver

Author: Stas Sergeev (stsp)

When clang is passed, say, `-target aarch64-unknown-linux-gnu -fuse-ld=bfd` it doesn't invoke `aarch64-unknown-linux-gnu-ld` but just `ld.bfd`. I wonder if it is intentional, or just a not implemented feature?