Fix a bad location in -Wparentheses fix-it hint

The code used getLocStart() instead of getLocEnd().  This works for single
token expressions, but breaks if the expression is longer.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@216306 91177308-0d34-0410-b5e6-96231b3b80d8