8001471: Klass::cast() does nothing

hotspot/src/share/vm/c1/c1_Runtime1.cpp

hotspot/src/share/vm/ci/ciEnv.cpp

hotspot/src/share/vm/ci/ciType.cpp

hotspot/src/share/vm/classfile/classFileParser.cpp

hotspot/src/share/vm/classfile/dictionary.cpp

hotspot/src/share/vm/classfile/javaClasses.cpp

hotspot/src/share/vm/classfile/javaClasses.hpp

hotspot/src/share/vm/classfile/loaderConstraints.cpp

hotspot/src/share/vm/classfile/placeholders.cpp

hotspot/src/share/vm/classfile/placeholders.hpp

hotspot/src/share/vm/classfile/systemDictionary.cpp

hotspot/src/share/vm/code/dependencies.cpp

hotspot/src/share/vm/code/nmethod.cpp

hotspot/src/share/vm/compiler/disassembler.cpp

hotspot/src/share/vm/interpreter/bytecodeInterpreter.cpp

hotspot/src/share/vm/interpreter/interpreterRuntime.cpp

hotspot/src/share/vm/interpreter/linkResolver.cpp

hotspot/src/share/vm/memory/metaspaceShared.cpp

hotspot/src/share/vm/memory/universe.cpp

hotspot/src/share/vm/oops/arrayKlass.cpp