Reland "[clang][RISCV] Add big-endian RISC-V target support" (#177939)
The problem was using the `--rtlib=platform` without
`--unwindlib=platform` conflicts the default unwindlib with the
Fuchsia's configuration, and that is why the test failed.
Orignal PR: https://github.com/llvm/llvm-project/pull/165599
The fail was reported at:
https://github.com/llvm/llvm-project/pull/165599#issuecomment-3751750804
Co-authored-by: Djordje Todorovic <djordje.todorovic@syrmia.com>