NewGVN: Add UnknownExpression and create them for things we can't symbolize. Kill...

NewGVN: Add UnknownExpression and create them for things we can't symbolize. Kill fragile machinery for handling null expressions.

Summary:
This avoids the very fragile code for null expressions. We could also use a denseset that tracks which things have null expressions instead, but that seems pretty fragile and premature optimization.

This resolves a number of infinite loop cases, test reductions coming.

Reviewers: davide

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D28193

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290816 91177308-0d34-0410-b5e6-96231b3b80d8