[lworld] C2 compilation fails with assert "meet not symmetric"

Merging JDK-8240676 causes Valhalla tests to trigger the "meet not symmetric" assert in type.cpp:

=== Meet Not Symmetric ===
t = stable:valuetype[8]:{compiler/valhalla/valuetypes/MyValue2, compiler/valhalla/valuetypes/MyValue2, java/lang/Integer, [I, int, long, short, int}[int:1]
this= stable:narrowoop: java/lang/Integer:TopPTR:exact *,iid=top (inline_depth=InlineDepthTop)[int:1]
mt=(t meet this)= stable:narrowoop: java/lang/Integer:NotNull:exact *[int:1]
t_dual= valuetype[8]:{compiler/valhalla/valuetypes/MyValue2, compiler/valhalla/valuetypes/MyValue2, java/lang/Integer, [I, int, long, short, int}[int:1]
this_dual= narrowoop: java/lang/Integer:exact *[int:1]
mt_dual= narrowoop: java/lang/Integer:AnyNull:exact *,iid=top (inline_depth=InlineDepthTop)[int:1]
mt_dual meet t_dual= narrowoop: java/lang/Integer:NotNull:exact *[int:1]
mt_dual meet this_dual= narrowoop: java/lang/Integer:exact *[int:1]