[9] RFR (XS): 8160360: Mismatched field loads are folded in LoadNode::Value

[Vladimir Ivanov]

http://cr.openjdk.java.net/~vlivanov/8160360/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8160360

Mismatched access check is absent for fields in LoadNode::Value().

The fix adds missing check.

Also, marked all "wide" on-heap accesses as mismatched. It's possible 
the type is narrowed later (e.g., during post-parse/incremental 
inlining) and becomes mismatched.

Testing: failing tests, JPRT, PIT (hs-tier0-comp).

Best regards,
Vladimir Ivanov