[13] RFR (S): 8219902: C2: MemNode::can_see_stored_value() ignores casts which carry control dependency

[Vladimir Ivanov]

http://cr.openjdk.java.net/~vlivanov/8219902/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8219902

JDK-8161334 [1] enhanced MemNode::can_see_stored_value to ignore casts 
when access base addresses are compared. It turned out to be too 
aggressive since casts may carry control dependency.

Proposed fix is to keep casts with control dependency.

Testing: failing test case, tier1-3

Best regards,
Vladimir Ivanov

[1] https://bugs.openjdk.java.net/browse/JDK-8161334