[clang] [HIP] Check if Input is a file before constructing link job (PR #183492)

[Dmitry Sidorov via cfe-commits]

MrSidims wrote:

Not 100% sure, how to write a proper unit test for this. May be just reuse https://gcc.godbolt.org/z/TqcbT7GnK (thanks @AlexVlx for the repro)?

https://github.com/llvm/llvm-project/pull/183492