lit fixes for lld.
lit fixes for lld.

It was not using LLVM_LIT_TOOLS_DIR and at least on my VM never finding lib.exe.

With this all the COFF tests show up as supported and pass.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@244107 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld