Summary:
The symbolizer was checking for .debug as a subdirectory of the
binary file itself, not of the directory containing the binary. This led to
a failure to find split debug info when it was contained in a .debug directory.
Reviewers: rnk, glider, zturner
Subscribers: llvm-commits, aprantl
Differential Revision: https://reviews.llvm.org/D44025
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@326630 91177308-0d34-0410-b5e6-96231b3b80d8
