[16] RFR(T) 8005088: remove unused NativeInstruction::test methods

[Vladimir Kozlov]

https://cr.openjdk.java.net/~kvn/8005088/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8005088

Only SPARC implemented NativeInstruction::test() methods [1]. And it is was removed in JDK 15 with SPARC port.

I think we can remove them on other platforms where they are not implemented.
If someone wants to recreate test, they should do that as gtest test(s).

Thanks,
Vladimir

[1] https://hg.openjdk.java.net/jdk/jdk14/file/6c954123ee8d/src/hotspot/cpu/sparc/nativeInst_sparc.cpp#l356