Disable warning 4530 for MSVC builds.
Disable warning 4530 for MSVC builds.

We compile with exceptions off for LLVM and all other LLVM
subprojects, so this brings parity to LLD and disables this
warning.

Reviewed by: Rui Ueyama

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@223131 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld