tree-optimization/102008 - restore if-conversion of adjacent loads

tree-optimization/102008 - restore if-conversion of adjacent loads

The following re-orders the newly added code sinking pass before
the last phiopt pass which performs hoisting of adjacent loads
with the intent to enable if-conversion on those.

I've added the aarch64 specific testcase from the PR.

2022-03-16  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/102008
	* passes.def: Move the added code sinking pass before the
	preceeding phiopt pass.

	* gcc.target/aarch64/pr102008.c: New testcase.