vmStructs.cpp defines static fields for many/most of the StubRoutine intrinsics where only _call_stub_return_address is useful and used by the SA.

These other StubRoutine field definitions should be removed so people adding new intrinsics don't think they have to add them to this list like in PR https://github.com/openjdk/jdk/pull/14224

Since these are intrinsics, they won't be found in core files and stack traces that the SA helps with unless they crashed themselves. Since support isn't very useful for these, they should be removed from vmStructs.cpp