Fixed IRForTarget to not recognize $__lldb variables as persistent variables.  These are special markers used by LLDB.
Fixed IRForTarget to not recognize $__lldb variables
as persistent variables.  These are special markers
used by LLDB.


git-svn-id: b33bab8abb5b18c12ee100cd7761ab452d00b2b0@117078 91177308-0d34-0410-b5e6-96231b3b80d8

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