Fix up dependency file name printing to more closely match that of gcc, including fixing a nasty recent regression that could make us print "/foo.h" with a command-line including "-I ./".

rdar://problem/9734352



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@134728 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed