tree-optimization/124034 - remove early-break special-casing of inductions

tree-optimization/124034 - remove early-break special-casing of inductions

After recent improvements to how we deal with early-break requirements
of induction variable updates we no longer need to force induction
latch defs relevant.  This in turn makes only-live defs visible to
SLP discovery, resolving the miscompilation in this PR.

	PR tree-optimization/124034
	* tree-vect-stmts.cc (process_use): Never force induction
	latch defs relevant when doing early break vectorization.

	* gcc.dg/vect/vect-early-break_142-pr124034.c: New testcase.