assert(!_reg_node[reg_lo] || edge_from_to(_reg_node[reg_lo],def)) failed: before block local schedul

Regression after 6340864 changes:

#
# Internal Error (/tmp/jprt/P1/170446.vkozlov/s/src/share/vm/opto/output.cpp:2632), pid=5359, tid=32
# assert(!_reg_node[reg_lo] || edge_from_to(_reg_node[reg_lo],def)) failed: before block local scheduling
#