sun.jvm.hotspot.runtime.VM.buildLongFromIntsPD() has only two users:
1. StackValueCollection.longAt()
2. ConstantPool.getLongAt()

Its use in ConstantPool.getLongAt() is incorrect and is replaced with Address.getJLongAt() in https://bugs.openjdk.org/browse/JDK-8311971.
The other user StackValueCollection.longAt() is dead code and not used anywhere.

This task is to remove sun.jvm.hotspot.runtime.VM.buildLongFromIntsPD() and clean up the dead code in sun.jvm.hotspot.runtime.StackValueCollection as well.