hg: jdk8u/jdk8u/hotspot: 8191915: JCK tests produce incorrect results with C2

[felix.yang at huawei.com]

Changeset: 85c5bc8157df
Author:    rbackman
Date:      2018-01-18 19:21 +0100
URL:       https://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/rev/85c5bc8157df

8191915: JCK tests produce incorrect results with C2
Reviewed-by: thartmann, vlivanov, goetz, andrew

! src/share/vm/opto/mathexactnode.cpp
! src/share/vm/opto/mathexactnode.hpp
+ test/compiler/intrinsics/mathexact/LongMulOverflowTest.java