Don't call DisableBreakpointSite (i.e. don't try to remove the breakpoint from the target process) if the target process is no longer alive.
Don't call DisableBreakpointSite (i.e. don't try to remove the breakpoint from the target process) if the target
process is no longer alive.

<rdar://problem/13320991>


git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@178936 91177308-0d34-0410-b5e6-96231b3b80d8

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