[PATCH] IR: Make the X / undef -> undef fold match the comment

[Justin Bogner via llvm-commits]

The constant folding for sdiv and udiv has a big discrepancy between the
comments and the code, which looks like a typo. Currently, we're folding
X / undef pretty inconsistently:

  0 / undef -> undef
  C / undef -> 0
  undef / undef -> 0

Whereas the comments state we do X / undef -> undef. The logic that
returns zero is actually commented as doing undef / X -> 0, despite that
the LHS isn't undef in many of the cases that hit it.

Is this okay to commit, or is it the comments that should be updated to
match the code instead?

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