Request for reviews (S): 6910484: incorrect integer optimization (loosing and op-r in a given example)

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/6910484/webrev

Fixed 6910484: incorrect integer optimization (loosing and op-r in a given example)

Problem:
After 6667595 changes Div node ideal optimization incorrectly
removes AND operation if mask is larger then shift:

(x & -32)/2 incorrectly transformed to x/2

Solution:
Remove AND operation only if mask is equal to shift.
Add regression test.

Reviewed by:

Fix verified (y/n): y, test

Other testing:
JPRT