PATCH: suppress warnings in llvm-link

[Eli Bendersky]

Hello,

Attaching a patch that adds a -suppress-warnings flag to the LLVM bitcode
linker, with the expected effect.

The option is currently added directly into LinkModules.cpp; an alternative
would be to add it to llvm-link.cpp, but then it would have to be
percolated down to ModuleLinker through Linker etc. I can modify the patch
to take that path, if that's deemed better. If the warning goes into
llvm-link.cpp, it may also make sense to turn it to "-w" to be just like in
Clang.

PTAL,

Eli
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