This script when attached to a breakpoint will continue lldb if the provided function doesn't appear in the current backtrace.

continueOnFunctionMiss.py

#!/usr/bin/env python

'''

	This script when attached to a breakpoint will continue lldb if the provided
	function doesn't appear in the current backtrace.

	To use this script, add a file called .lldbinit to your home directory,
	with the following line:
	
	command script import <PATH TO THIS SCRIPT>
    
	Then add the command "continueOnFunctionMiss functionName" to an XCode breakpoint.

'''

import lldb

def continueOnFunctionMiss (debugger, command, result, internal_dict):
    if len (command) > 0:
        process = debugger.GetSelectedTarget ().GetProcess ()
        thread = process.GetSelectedThread ()

        for frame in thread:
            function = frame.GetFunction ()
            if function.IsValid ():
                if function.GetDisplayName () == command:
                    return
            
        if process.IsValid ():
            lldb.debugger.SetAsync (True)
            process.Continue ()
          
def __lldb_init_module (debugger, internal_dict):
    debugger.HandleCommand ('command script add -f continueOnFunctionMiss.continueOnFunctionMiss continueOnFunctionMiss')
    print 'The "continueOnFunctionMiss" python command has been installed and is ready for use.'