Revert r341269: [Constant Hoisting] Hoisting Constant GEP Expressions

One of the tests is failing 50% of the time when expensive checks are
enabled. Not sure how deep the problem is so just reverting while the
author can investigate so that the bots stop repeatedly failing and
blaming things incorrectly. Will respond with details on the original
commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341365 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed