Auto merge of #28734 - servo:jdm-patch-52, r=jdm

Unbreak lldb invocations.

The underlying mozdebug now includes a -- in the command line, so `./mach run --debug` is broken if we add it explicitly.

python/servo/post_build_commands.py

@@ -162,8 +162,7 @@ class PostBuildCommands(CommandBase):
                     command = rustCommand
 
             # Prepend the debugger args.
-            args = ([command] + self.debuggerInfo.args + ["--"]
-                    + args + params)
+            args = ([command] + self.debuggerInfo.args + args + params)
         else:
             args = args + params