Refine the fix in r187094 to only distrust the StackID comparision when we are starting from an address with no symbols.
If we don't do that "nexti" will stop too soon when stepping past a tail call jump.

rdar://problem/14516227


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@187173 91177308-0d34-0410-b5e6-96231b3b80d8