loop-iv: Add missing calls to `onlyjump_p'

loop-iv: Add missing calls to `onlyjump_p'

Ignore jumps that have side effects in loop processing as pasting the
body of a loop multiple times within is semantically equivalent to jump
deletion (between the iterations unrolled) even if we do not physically
delete the jump RTL insn.

	gcc/
	* loop-iv.c (simplify_using_initial_values): Only process jumps
	that match `onlyjump_p'.
	(check_simple_exit): Likewise.