In case some valid class, interface and interface method are provided for CompilerToVM::getVtableIndexForInterface, there will be a crash in case class represented by 1st parameter(HotSpotResolvedObjectTypeImpl, got from CompilerToVM::lookupType) is not initialized.

A crash should be avoided or javadoc should be updated to mention undefined behaviour for such case

a crash info:
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007f8b11dd2394, pid=21334, tid=0x000000000000537a
#
# JRE version: Java(TM) SE Runtime Environment (9.0) (build 1.9.0-internal-dmitrij_2015_09_16_19_59-b00)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (1.9.0-internal-dmitrij_2015_09_16_19_59-b00, mixed mode, tiered, compressed oops, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x817394] LinkResolver::vtable_index_of_interface_method(KlassHandle, methodHandle const&)+0x104

(hs_err is in attachment)