Tweak the extraction of the "interesting" part of a source range in two ways:

Tweak the extraction of the "interesting" part of a source range in two ways:

  1) First of all, we treat _ as part of an identifier and not as
  punctuation (oops).
  2) Second of all, always make sure that the token that the ^ is
  pointing at is fully within the "interesting" part of the range.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@70831 91177308-0d34-0410-b5e6-96231b3b80d8