[7u] RFR: 8250861: Crash in MinINode::Ideal(PhaseGVN*, bool)

[Andrew Brygin]

Hello,

 I would like to backport the fix for 8250861 to jdk7u:

Bug: https://bugs.openjdk.java.net/browse/JDK-8250861
Webrev: http://cr.openjdk.java.net/~bae/7u/8250861/webrev.v00/

 8u patch applied cleanly. No 7u-specific changes were required:
 https://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/rev/b36c3f635d93

 This is a regression caused by the security patch for JDK-8241114,
which was a part of openjdk7u281. The issue 8250861 has been resolved in
interim 13.0.5.1, 11.0.9.1, and openjdk8u275 releases, and needs to be
resolved in openjdk7u as well.

 The change has been tested with hotspot regression tests.

Thanks,
Andrew