8129094 fix is incomplete

Looks like the fix for 8129094 is incomplete. I still see nightly failures:

# Internal Error (hotspot/src/cpu/x86/vm/x86.ad:1702), pid=27015, tid=0xee2ffb70
# assert(is_java_primitive(bt)) failed: only primitive type vectors
#
# JRE version: Java(TM) SE Runtime Environment (9.0) (build 1.9.0-internal-fastdebug-20150624173424.drlong.jdk9-comp-b00)
# Java VM: Java HotSpot(TM) Server VM (1.9.0-internal-fastdebug-20150624173424.drlong.jdk9-comp-b00 compiled mode linux-x86 )

Stack: [0xee27f000,0xee300000], sp=0xee2fcbf0, free space=502k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x107e1fa] VMError::report_and_die()+0x19a;; VMError::report_and_die()+0x19a
V [libjvm.so+0x753196] report_vm_error(char const*, int, char const*, char const*)+0x76;; report_vm_error(char const*, int, char const*, char const*)+0x76
V [libjvm.so+0x1b36d2] Matcher::max_vector_size(BasicType)+0x142;; Matcher::max_vector_size(BasicType)+0x142
V [libjvm.so+0xf83394] SuperWord::unrolling_analysis(CountedLoopNode*, int&)+0x674;; SuperWord::unrolling_analysis(CountedLoopNode*, int&)+0x674
V [libjvm.so+0xc367df] IdealLoopTree::policy_unroll_slp_analysis(CountedLoopNode*, PhaseIdealLoop*, int)+0x3bf;; IdealLoopTree::policy_unroll_slp_analysis(CountedLoopNode*, PhaseIdealLoop*, int)+0x3bf
V [libjvm.so+0xc3c041] IdealLoopTree::policy_unroll(PhaseIdealLoop*)+0x521;; IdealLoopTree::policy_unroll(PhaseIdealLoop*)+0x521
V [libjvm.so+0xc3f74f] IdealLoopTree::iteration_split_impl(PhaseIdealLoop*, Node_List&)+0x1af;; IdealLoopTree::iteration_split_impl(PhaseIdealLoop*, Node_List&)+0x1af