assert(i == p->size()-1) failed: must be last element of the pack

JavaFuzzer test failed with
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (open/src/hotspot/share/opto/superword.cpp:2053), pid=3387, tid=3398
# assert(i == p->size()-1) failed: must be last element of the pack
#
# JRE version: Java(TM) SE Runtime Environment (14.0+10) (fastdebug build 14-ea+10-332)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 14-ea+10-332, mixed mode, sharing, tiered, compressed oops, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x162370e] SuperWord::profitable(Node_List*)+0x47e
#
# Core dump will be written. Default location: Core dumps may be processed with "/usr/libexec/abrt-hook-ccpp %s %c %p %u %g %t e %P %I %h" (or dumping to /tmp/fuzzer.tmp.DyMIHLD0sJ/core.3387)
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#

--------------- S U M M A R Y ------------

Command Line: -Xmx1G Test

Host: Intel(R) Xeon(R) CPU E5-2690 0 @ 2.90GHz, 4 cores, 14G, Oracle Linux Server release 7.5
Time: Thu Aug 22 06:56:29 2019 UTC elapsed time: 1 seconds (0d 0h 0m 1s)

--------------- T H R E A D ---------------

Current thread (0x00007f6940257800): JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=3398, stack(0x00007f6917177000,0x00007f6917278000)]


Current CompileTask:
C2: 1022 61 ! 4 Test::mainTest (562 bytes)

Stack: [0x00007f6917177000,0x00007f6917278000], sp=0x00007f6917272300, free space=1004k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x162370e] SuperWord::profitable(Node_List*)+0x47e
V [libjvm.so+0x1625cf0] SuperWord::filter_packs()+0x130
V [libjvm.so+0x1639102] SuperWord::SLP_extract()+0x222
V [libjvm.so+0x1639630] SuperWord::transform_loop(IdealLoopTree*, bool)+0x220
V [libjvm.so+0x11e1070] PhaseIdealLoop::build_and_optimize(LoopOptsMode)+0x11e0
V [libjvm.so+0x9c6b2a] PhaseIdealLoop::optimize(PhaseIterGVN&, LoopOptsMode)+0x2ea
V [libjvm.so+0x9c3c64] Compile::Optimize()+0xbc4
V [libjvm.so+0x9c527f] Compile::Compile(ciEnv*, C2Compiler*, ciMethod*, int, bool, bool, bool, DirectiveSet*)+0x109f
V [libjvm.so+0x807cad] C2Compiler::compile_method(ciEnv*, ciMethod*, int, DirectiveSet*)+0x10d
V [libjvm.so+0x9d1962] CompileBroker::invoke_compiler_on_method(CompileTask*)+0x2d2
V [libjvm.so+0x9d2858] CompileBroker::compiler_thread_loop()+0x3b8
V [libjvm.so+0x16cac36] JavaThread::thread_main_inner()+0x226
V [libjvm.so+0x16d0276] Thread::call_run()+0xf6
V [libjvm.so+0x13ecede] thread_native_entry(Thread*)+0x10e