Fix unused variable from r240792.

The variable 'I' wasn't used when assertions were disabled.
This commit ensures that 'I' is used outside of an assert.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240797 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed