Make ProcessLinux return true for DetachRequiresHalt() because PTRACE_DETACH requires this.

llvm-svn: 204759

lldb/source/Plugins/Process/Linux/ProcessLinux.h

@@ -57,6 +57,9 @@ public:
     virtual lldb_private::Error
     DoDetach(bool keep_stopped);
 
+    virtual bool
+    DetachRequiresHalt() { return true; }
+
     virtual bool
     UpdateThreadList(lldb_private::ThreadList &old_thread_list, lldb_private::ThreadList &new_thread_list);