Fix a place in GDBRemoteCommunicationClient::SendContinuePacketAndWaitForReply...

Fix a place in GDBRemoteCommunicationClient::SendContinuePacketAndWaitForReply where we weren't taking
m_interrupt_sent into account.  Also don't reset m_interrupt_sent in SendInterrupt but do so in SendPacketAndWaitForResponse
when we know we've handled the interrupt.
Fix a code path through ProcessGDBRemote::DoDestroy where we were tearing down the debug session but
not setting the exit status.

llvm-svn: 158043