[NewGVN] Fix handling of assumes

This patch fixes two bugs:

* test1: Previously assume(a >= 5) concluded that a == 5. That's only
         valid for assume(a == 5)...
* test2: If operands were swapped, additional users were added to the
         wrong cmp operand. This resulted in an "unsettled iteration"
         assertion failure.

Patch by Nikita Popov

Differential Revision: https://reviews.llvm.org/D46974


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@333007 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed