Revert r307581, "Avoid doing conservative phi checks in aliasSameBasePointerGEPs() if no phis have been visited yet."

It broke stage2 tests in selfhosting.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307613 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed