18fa1d380d
Fix regression where we aren't passing `-platform_version` to new ld64.lld after {D95204}.
Most of the changes were originally in D95204, but I backed them out due to
test failures on builds which have `CLANG_DEFAULT_LINKER=lld`. The tests are
properly updated in this diff.
Reviewed By: #lld-macho, thakis
Differential Revision: https://reviews.llvm.org/D97741