8159515: Improve indy validation

Reviewed-by: jrose, hseigel, vlivanov, bmoloden, ctornqvi, mschoene

src/share/vm/prims/jvm.cpp

@@ -2626,7 +2626,6 @@ JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_i
   switch (cp->tag_at(cp_index).value()) {
     case JVM_CONSTANT_InterfaceMethodref:
     case JVM_CONSTANT_Methodref:
-    case JVM_CONSTANT_NameAndType:  // for invokedynamic
       return cp->uncached_name_ref_at(cp_index)->as_utf8();
     default:
       fatal("JVM_GetCPMethodNameUTF: illegal constant");
@@ -2644,7 +2643,6 @@ JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint
   switch (cp->tag_at(cp_index).value()) {
     case JVM_CONSTANT_InterfaceMethodref:
     case JVM_CONSTANT_Methodref:
-    case JVM_CONSTANT_NameAndType:  // for invokedynamic
       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
     default:
       fatal("JVM_GetCPMethodSignatureUTF: illegal constant");