C2: assert(found_sfpt) failed: no node in loop that's not input to safepoint

Generated test crashed with:
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (open/src/hotspot/share/opto/loopnode.cpp:997), pid=2497, tid=2509
# assert(found_sfpt) failed: no node in loop that's not input to safepoint
#
# JRE version: Java(TM) SE Runtime Environment (15.0+12) (fastdebug build 15-ea+12-431)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 15-ea+12-431, compiled mode, sharing, tiered, compressed oops, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x1027095] LoopNode::verify_strip_mined(int) const+0x685
#
# 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.GvrFgw4AwR/core.2497)
#
# If you would like to submit a bug report, please visit:
# https://bugreport.java.com/bugreport/crash.jsp
#

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

Command Line: -Xmx1G -Xcomp -Xbatch -XX:CompileOnly=Test Test

Host: Intel Core Processor (Broadwell), 12 cores, 28G, Oracle Linux Server release 7.5
Time: Fri Feb 28 23:33:48 2020 UTC elapsed time: 16 seconds (0d 0h 0m 16s)

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

Current thread (0x00007f4a2433e000): JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=2509, stack(0x00007f49f3afb000,0x00007f49f3bfc000)]


Current CompileTask:
C2: 16378 77 b 4 Test::vMeth1 (322 bytes)

Stack: [0x00007f49f3afb000,0x00007f49f3bfc000], sp=0x00007f49f3bf5d00, free space=1003k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x1027095] LoopNode::verify_strip_mined(int) const+0x685
V [libjvm.so+0x10277d7] CountedLoopNode::skip_strip_mined(int)+0x47
V [libjvm.so+0x10014ea] PhaseIdealLoop::loop_predication_impl(IdealLoopTree*) [clone .part.94]+0x92a
V [libjvm.so+0x1001ee9] IdealLoopTree::loop_predication(PhaseIdealLoop*)+0x109
V [libjvm.so+0x1001e08] IdealLoopTree::loop_predication(PhaseIdealLoop*)+0x28
V [libjvm.so+0x1001e08] IdealLoopTree::loop_predication(PhaseIdealLoop*)+0x28
V [libjvm.so+0x1001e25] IdealLoopTree::loop_predication(PhaseIdealLoop*)+0x45
V [libjvm.so+0x1001e25] IdealLoopTree::loop_predication(PhaseIdealLoop*)+0x45
V [libjvm.so+0x1001e25] IdealLoopTree::loop_predication(PhaseIdealLoop*)+0x45
V [libjvm.so+0x103d3b0] PhaseIdealLoop::build_and_optimize(LoopOptsMode)+0x12c0
V [libjvm.so+0x86f61a] PhaseIdealLoop::optimize(PhaseIterGVN&, LoopOptsMode)+0x2ea
V [libjvm.so+0x86c773] Compile::Optimize()+0x973
V [libjvm.so+0x86de44] Compile::Compile(ciEnv*, C2Compiler*, ciMethod*, int, bool, bool, bool, DirectiveSet*)+0x1084
V [libjvm.so+0x6dc580] C2Compiler::compile_method(ciEnv*, ciMethod*, int, DirectiveSet*)+0x110
V [libjvm.so+0x87a91c] CompileBroker::invoke_compiler_on_method(CompileTask*)+0x2cc
V [libjvm.so+0x87b8b8] CompileBroker::compiler_thread_loop()+0x458
V [libjvm.so+0x152d896] JavaThread::thread_main_inner()+0x226
V [libjvm.so+0x1532916] Thread::call_run()+0xf6
V [libjvm.so+0x12651e6] thread_native_entry(Thread*)+0x116

Register to memory mapping: