Currently lld uses base names of files to match against file patterns in

linker script SECTION rules. This patch extends it to use a fully specified
file name as it appears in --trace output to match agains, i.e,
"<path>/<objname>.o" or "<path>/<libname>.a(<objname>.o)".

Differential Revision: https://reviews.llvm.org/D37031

llvm-svn: 311713