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

^build/
^dist/
^.idea/
nbproject/private/
^webrev
^.src-rev$
^.jib/
\.DS_Store
\.metadata/
\.recommenders/
test/nashorn/script/external
test/nashorn/lib
NashornProfile.txt
.*/JTreport/.*
.*/JTwork/.*
.*/.git/.*