Request for reviews (S): 7132936: guarantee(t != NULL) failed: must be con

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/7132936/webrev

7132936: guarantee(t != NULL) failed: must be con

Use !higher_equal() check to skip top and values which fit. LoadNode::Ideal() 
will return value's type in such cases.

Verified with failed tests.

Thanks,
Vladimir