[lld] Small patch to ignore "/natvis:..." flag in the COFF / lld-link.exe frontend.

[Michael Rickert via llvm-commits]

MSVC's link.exe supports an undocumented flag, /natvis:path/to/a/file.natvis, which will embed natvis files into generated pdbs - useful for dealing with multiple versions and ease of use when debugging (no IDE setup required!)

The attached patch simply makes LLVM's lld-link.exe ignore this flag for now, fixing a recent rustc regression of mine:  https://github.com/rust-lang/rust/pull/43221#issuecomment-328276585 .  I intend to add a "temporary" workaround on rustc's end as well.
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