[NewPM][LoopUnroll] Rename unroll* to loop-unroll*

The legacy pass is called "loop-unroll", but in the new PM it's called "unroll".
Also applied to unroll-and-jam and unroll-full.

Fixes various check-llvm tests when NPM is turned on.

Reviewed By: Whitney, dmgreen

Differential Revision: https://reviews.llvm.org/D82590