[IR] Put a comment back on a function it belongs to. NFC

Looks like the function was moved to a different part of the class in December, but the comment didn't move with it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305139 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed