Back out r221229 -- instead of trying to identify the end of the unwind,

let's let lldb try the arch default unwind every time but not destructively --
it doesn't permanently replace the main unwind method for that function from
now on.

This fix is for <rdar://problem/18683658>.  

I tested it against Ryan Brown's go program test case and also a
collection of core files of tricky unwind scenarios 
<rdar://problem/15664282> <rdar://problem/15835846>
<rdar://problem/15982682> <rdar://problem/16099440>
<rdar://problem/17364005> <rdar://problem/18556719> 
that I've fixed over the last 6-9 months.

llvm-svn: 221238