We can't (don't want to) honor the same set of "-fuse-ld" flags with
WebAssembly since the ELF linkers (ld.lld, ld.gnu, etc) don't work with
wasm object files.
Instead we implement our own linker finding logic, similar or other
non-ELF platforms like MSVC.
We've had a few issues with CLANG_DEFAULT_LINKER overriding the
WebAssembly linker which doesn't make sense since there is no generic
linker that can handle WebAssembly today.
Differential Revision: https://reviews.llvm.org/D59743
llvm-svn: 356953
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