Change the AppleObjCTrampolineHandler to always run all threads when resolving the target of an ObjC method call.
Add a StopOthers method to AppleThreadPlanStepThroughObjCTrampoline, don't rely on the setting in the ThreadPlanToCallFunction, since that
gets pushed too late to determine which threads will continue.

<rdar://problem/13447638>


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@177691 91177308-0d34-0410-b5e6-96231b3b80d8