Fix whitespace.

This script used an inconsistent mix of spaces and tabs, and even
ignoring that, it still had inconsistent indentation, which is
pretty scary for a Python script. I also removed trailing whitespace
from some lines.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@172237 91177308-0d34-0410-b5e6-96231b3b80d8