Fixed an assertion that happened when debugging DWARF in .o files with debug map on macosx.
Fixed an assertion that happened when debugging DWARF in .o files with debug
map on macosx.



git-svn-id: b33bab8abb5b18c12ee100cd7761ab452d00b2b0@113737 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb