RFR(S): 8229483: Sinking load out of loop may trigger: assert(found_sfpt) failed: no node in loop that's not input to safepoint

[Roland Westrelin]

Thanks for the review, Nils.

Valhalla testing found a similar issue: the load is first sunk into an
inner strip mined loop where there's an anti dependent store, then the
store becomes a candidates to be moved after the loop and finally the
load is scheduled in the outer strip mined loop and verification code
fires. The logic I proposed before doesn't help because the load is
first moved into the inner loop. Here is a fix that covers both cases:

http://cr.openjdk.java.net/~roland/8229483/webrev.01/

Roland.