6979683: inconsistent interaction of reference cast with box/unbox conversions leaves out a useful case
Summary: Allow casts which narrow and then unbox.
Reviewed-by: mcimadamore
TestCast6979683_BAD37.java:37:61: compiler.err.prob.found.req: (compiler.misc.inconvertible.types), java.lang.Comparable<java.lang.Short>, int
1 error