[MinGW] Ignore the --plugin and --plugin-opt option
[MinGW] Ignore the --plugin and --plugin-opt option

GCC can use LLD with -fuse-ld=lld for MinGW these days, but by
default these options are passed to the linker (unless -fno-lto
is passed to the GCC driver).

Differential Revision: https://reviews.llvm.org/D57304

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@352459 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld