hg: jdk/hs: 8191887: assert(b->is_Bool()) in PhaseIdealLoop::clone_iff() due to Opaque4 node

[vladimir.kozlov at oracle.com]

Changeset: feea6d82adc2
Author:    roland
Date:      2017-11-27 16:05 -0800
URL:       http://hg.openjdk.java.net/jdk/hs/rev/feea6d82adc2

8191887: assert(b->is_Bool()) in PhaseIdealLoop::clone_iff() due to Opaque4 node
Summary: add special handling for graph shape If->Opaque4->Bool->CmpP
Reviewed-by: kvn

! src/hotspot/share/opto/loopnode.hpp
! src/hotspot/share/opto/loopopts.cpp
+ test/hotspot/jtreg/compiler/unsafe/TestLoopUnswitching.java