8075922: assert(t == t_no_spec) fails in phaseX.cpp
Summary: subgraph becomes dead RegionNode::Ideal() but is not destroyed
Reviewed-by: kvn, vlivanov
^build/
^dist/
^webrev
/nbproject/private/
^src/share/tools/hsdis/build/
^src/share/tools/IdealGraphVisualizer/[a-zA-Z0-9]*/build/
^src/share/tools/IdealGraphVisualizer/build/
^src/share/tools/IdealGraphVisualizer/dist/
^.hgtip
.DS_Store