[FileSystem] Change FileSpec constructor signature.
[FileSystem] Change FileSpec constructor signature.

Fix breakage due to the recent FileSpec change that extracts the path
resultion logic into FileSystem for the Android host.

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@345891 91177308-0d34-0410-b5e6-96231b3b80d8

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