[lldb] Fix occasional hangs of VSCode testcases

On slower machines the vscode testcases were sometimes hanging:

  1910 ? Sl 0:00 |   \_ /usr/bin/python .../llvm/tools/lldb/test/dotest.py ... -p TestVSCode_setBreakpoints.py
  2649 ? Sl 0:00 |       \_ .../build/bin/lldb-vscode
  2690 ? S  0:00 |           \_ .../build/bin/lldb-server gdbserver --fd=9 --native-regs --setsid
  2708 ? t  0:00 |               \_ .../build/lldb-test-build.noindex/tools/lldb-vscode/breakpoint/TestVSCode_setBreakpoints.test_functionality/a.out

A reproducer of the racy bug for send_recv():
#         self.send_packet(command)
#+        import time
#+        time.sleep(1)
#         done = False

I guess `request_continue` was probably originally intended to be synchronous
but then it isn't and this code has been leftover there.

Differential revision: https://reviews.llvm.org/D65163

llvm-svn: 366850

Author: jankratochvil

lldb/packages/Python/lldbsuite/test/tools/lldb-vscode/vscode.py

@@ -498,13 +498,7 @@ def request_continue(self, threadId=None):
             'arguments': args_dict
         }
         response = self.send_recv(command_dict)
-        recv_packets = []
-        self.recv_condition.acquire()
-        for event in self.recv_packets:
-            if event['event'] != 'stopped':
-                recv_packets.append(event)
-        self.recv_packets = recv_packets
-        self.recv_condition.release()
+        # Caller must still call wait_for_stopped.
         return response
 
     def request_disconnect(self, terminateDebuggee=None):