The bug reported on the [0] has been fixed.
The issue was we have not checked if the global variables that
represent cttz tables was constant.
There is a new negative test added in negative-lower-table-based-cttz.ll
that represents this.
[0] https://reviews.llvm.org/rGdf868edee561eb973edd85ec9df41c67aa0bff6b
This reverts commit 053841c5624ca7eacd108a26071d8a1cefe1bebd.
We faced a use-after-free after pushing the D113291, since the
foldSqrt() has a call to eraseFromParent(). The function
should be at the end of the main loop that folds the patterns.
This patch fixes that.
