6889300: assert(i != k || is_new || i->outcnt() > 0, "don't return dead nodes")
Summary: PhiNode::Ideal() should return TOP for Phi node with no users.
Reviewed-by: never, jrose
^build/
^dist/
^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/