This doesn't change APIs, this just cleans up the many in-tree uses of these
names to use the new preferred names. We'll keep the old names around for a
couple weeks to help transitions.
Differential Revision: https://reviews.llvm.org/D99127
Summary: This updates the canonicalization documentation, and properly documents the different ways of canonicalizing operations.
Differential Revision: https://reviews.llvm.org/D77490