Reland "[lld/coff] Make lld-link work in a non-MSVC shell, add /winsysroot:"
This relands commit b3b2538d, except that the new files in Support are instead in a new library WindowsDriver.
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This relands commit b3b2538d, except that the new files in Support are instead in a new library WindowsDriver.
mentioned in commit 633e797d
mentioned in commit 0574b5fc
mentioned in commit 437d4e01
mentioned in commit c5fb05f6