Rollup merge of #147116 - workingjubilee:remove-tdl-abialign, r=Zalathar

compiler: remove AbiAlign inside TargetDataLayout

AbiAlign is a thin wrapper around Align, extant mostly because we used to track a separate quasi-notion of alignment that was never a real notion of alignment and removing all of it at once was too churny. This PR maintains AbiAlign usage in public API and most of the compiler, but direct access of these fields for TargetDataLayout is now in terms of Align only.

Author: Zalathar