Add a new function to Debugger for finding the top/current 
input reader.

Always make sure the input reader stack is not empty before
trying to get the top element from the stack.




git-svn-id: https://llvm.org/svn/llvm-project/llvdb/trunk@125255 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed