Update the context location of the condition of a conditional operator to the

Update the context location of the condition of a conditional operator to the
question mark instead of the context of the conditional operator.  The
condition does not need the context of the conditional operator at all.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@215048 91177308-0d34-0410-b5e6-96231b3b80d8