Fix handling of gdbserver binary packets with escape characters.

We were not properly handling the escape character 0x7d ('}') in responses
from gdbserver which used the binary protocol.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@202062 91177308-0d34-0410-b5e6-96231b3b80d8
Don’t process the stop reply packet as a generic signal if we already figured out what it was from other data in the packet.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@202066 91177308-0d34-0410-b5e6-96231b3b80d8