tree f04aa471433c1d632efade45f40767a7e0703b37
parent db06a7136695cff122ca353d7cb499a700c9e630
author Roman Lebedev <lebedev.ri@gmail.com> 1602676618 +0300
committer Copybara-Service <copybara-worker@google.com> 1604025714 -0700

Revert "Reland "[SCEV] Model ptrtoint(SCEVUnknown) cast not as unknown, but as zext/trunc/self of SCEVUnknown"" and it's follow-ups

While we haven't encountered an earth-shattering problem with this yet,
by now it is pretty evident that trying to model the ptr->int cast
implicitly leads to having to update every single place that assumed
no such cast could be needed. That is of course the wrong approach.

Let's back this out, and re-attempt with some another approach,
possibly one originally suggested by Eli Friedman in
https://bugs.llvm.org/show_bug.cgi?id=46786#c20
which should hopefully spare us this pain and more.

This reverts commits 1fb610429308a7c29c5065f5cc35dcc3fd69c8b1,
7324616660fc0995fa8c166e3c392361222d5dbc,
aaafe350bb65dfc24c2cdad4839059ac81899fbe,
e92a8e0c743f83552fac37ecf21e625ba3a4b11e.

I've kept&improved the tests though.

GitOrigin-RevId: 7ee6c402474a2f5fd21c403e7529f97f6362fdb3