hg: jdk/submit: 8214728: Unnecessary InstanceKlass::cast at few places

[calvin.cheung at oracle.com]

Changeset: f5d0926026ec
Author:    ccheung
Date:      2018-12-04 11:54 -0800
URL:       http://hg.openjdk.java.net/jdk/submit/rev/f5d0926026ec

8214728: Unnecessary InstanceKlass::cast at few places
Reviewed-by: lfoltan, jiangli, coleenp

! src/hotspot/share/classfile/verifier.cpp
! src/hotspot/share/interpreter/interpreterRuntime.cpp
! src/hotspot/share/interpreter/linkResolver.cpp