Add an Error string specifically for when we hit an ENOMEM when trying to mmap a file fails so parent caller function can  provide helpful information to use about what went wrong.
Add an Error string specifically for when we hit an ENOMEM when
trying to mmap a file fails so parent caller function can 
provide helpful information to use about what went wrong.



git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@155617 91177308-0d34-0410-b5e6-96231b3b80d8

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