hg: jdk/sandbox: 8210387: C2 compilation fails with "assert(node->_last_del == _last) failed: must have deleted the edge just produced"

[chris.hegarty at oracle.com]

Changeset: be8fe2a352be
Author:    thartmann
Date:      2018-09-12 09:23 +0200
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/be8fe2a352be

8210387: C2 compilation fails with "assert(node->_last_del == _last) failed: must have deleted the edge just produced"
Summary: Refresh iterator and start from the beginning while there is progress when removing dead regions.
Reviewed-by: kvn

! src/hotspot/share/opto/phaseX.cpp
+ test/hotspot/jtreg/compiler/c2/TestUnreachableRegionDuringCCP.java