[PATCH] llvm-link: Verify input modules

[Duncan P. N. Exon Smith]

This patch starts verifying input modules to `llvm-link`.  Otherwise,
broken input modules can cause assertions in `lib/Linker`.

I'm not sure what to do with test/Linker/2011-08-22-ResolveAlias.ll,
which fails like this:

Alias must point to a definition
i32 (i32*, void ()*)* @_ZL20__gthrw_pthread_oncePiPFvvE
Alias must point to a definition
i8* (i32)* @_ZL27__gthrw_pthread_getspecificj
...

@Rafael, you touched it last :) -- any idea if we have sufficient
coverage for the underlying feature elsewhere?  Or should I update
the test?

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