d4c070d801
If the index itself is already poison, the poison propagates through instructions clamping the index to a valid range. This still causes introducing a load of poison, as flagged by Alive2 and pointed out at 575e2aff5574. This patch updates the code to freeze the index, unless it is proven to not be poison. Reviewed By: nlopes Differential Revision: https://reviews.llvm.org/D103378