Modify MachThread::NotifyException() to allow the arch specific protocol to process the passed in (MachException::Data &)exc first before possible reassignment of the member m_stop_exception with exc.  This allows lldb to stop at the watchpoint of a simple test program.
Modify MachThread::NotifyException() to allow the arch specific protocol to process
the passed in (MachException::Data &)exc first before possible reassignment of the
member m_stop_exception with exc.  This allows lldb to stop at the watchpoint of
a simple test program.


git-svn-id: b33bab8abb5b18c12ee100cd7761ab452d00b2b0@139767 91177308-0d34-0410-b5e6-96231b3b80d8

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