[aarch64-port-dev ] RFR (S) 8228593: Revert explicit JDK 7 support additions

[Aleksey Shipilev]

This is 8-aarch64 specific issue:
  https://bugs.openjdk.java.net/browse/JDK-8228593

It does not look these changes are needed anymore: they apparently were used for JDK 7 support.
These changes show up as the differences against 8u upstream:
  https://builds.shipilev.net/patch-openjdk-jdk8-aarch64/hotspot/make/linux/makefiles/vm.make.sdiff.html

https://builds.shipilev.net/patch-openjdk-jdk8-aarch64/hotspot/src/share/vm/classfile/classFileParser.cpp.sdiff.html
  https://builds.shipilev.net/patch-openjdk-jdk8-aarch64/hotspot/src/share/vm/prims/jvm.cpp.sdiff.html

Webrev:
  http://cr.openjdk.java.net/~shade/8228593/webrev.01/

Testing: x86_64 builds, hotspot_gc_shenandoah (no, really, one of these days we would have tier1)

-- 
Thanks,
-Aleksey