8086057: Crash with "modified node is not on IGVN._worklist" when running with -XX:-SplitIfBlocks Summary: Pre-loop Opaque1 node 'pre_opaq' should be put on the IGVN worklist after modification. Reviewed-by: kvn

^build/
^dist/
^drop/
^drop_included/
^webrev
/nbproject/private/
^.hgtip