This patch includes some clean-ups to tryToCreateRecipe, suggested in
D77973.
It includes:
* Renaming tryToCreateRecipe to tryToCreateWidenRecipe.
* Move VPBB insertion logic to caller of tryToCreateWidenRecipe.
* Hoists instruction checks to tryToCreateWidenRecipe, making it
clearer which instructions are handled by which recipe, simplifying
the checks by using early exits.
* Split up handling of induction PHIs and truncates using inductions.
Reviewers: gilr, rengolin, Ayal, hsaito
Reviewed By: Ayal
Differential Revision: https://reviews.llvm.org/D78287
fa284e136e