Test case:
super public class DynamicConstantHelper
    version 55:0
{

static Method getDoubleConstant:"(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/Object;I)D"
    stack 2 locals 4
{
    dconst_0;
    dreturn;
}

static varargs Method getIntConstant:"(Ljava/lang/invoke/MethodHandles$Lookup;[Ljava/lang/Object;)I"
    stack 1 locals 2
{
    ldc int 6;
    ireturn;
}

public static Method "testDoubleConstantDynamic":"()V"
    stack 4 locals 1
{
    ldc2_w Dynamic REF_invokeStatic:
            DynamicConstantHelper.getDoubleConstant:
            "(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/Object;I)D":constDynDouble:"D" int 0;
    getstatic Field java/lang/System.out:"Ljava/io/PrintStream;";
    ldc String "testDoubleConstantDynamic: PASSED";
    invokevirtual Method java/io/PrintStream.println:"(Ljava/lang/String;)V";
    return;
}

public static Method "testIntConstantDynamic":"()V"
    stack 4 locals 1
{
    ldc_w Dynamic REF_invokeStatic:
            DynamicConstantHelper.getIntConstant:
            "(Ljava/lang/invoke/MethodHandles$Lookup;[Ljava/lang/Object;)I":constantdynamic:"I";
    getstatic Field java/lang/System.out:"Ljava/io/PrintStream;";
    ldc String "testIntConstantDynamic: PASSED";
    invokevirtual Method java/io/PrintStream.println:"(Ljava/lang/String;)V";
    return;
}
}

Error message:
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (bytecodeInterpreter.cpp:2406), pid=16603, tid=16615
# Error: ShouldNotReachHere()
#
# JRE version: OpenJDK Runtime Environment (15.0) (build 15-internal+0-adhoc.yangfei.openjdk-jdk)
# Java VM: OpenJDK 64-Bit Zero VM (15-internal+0-adhoc.yangfei.openjdk-jdk, interpreted mode, serial gc, linux-amd64)
# Core dump will be written. Default location: Core dumps may be processed with "/usr/share/apport/apport %p %s %c %d %P" (or dumping to /home/yangfei/openjdk
-jdk/JTwork/scratch/core.16603)
#
# If you would like to submit a bug report, please visit:
# https://bugreport.java.com/bugreport/crash.jsp
#

Proposed fix:

diff -r 1c7da538f065 src/hotspot/share/interpreter/bytecodeInterpreter.cpp
--- a/src/hotspot/share/interpreter/bytecodeInterpreter.cpp Tue Feb 25 10:34:33 2020 +0800
+++ b/src/hotspot/share/interpreter/bytecodeInterpreter.cpp Tue Feb 25 18:17:26 2020 +0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2002, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2002, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -2347,11 +2347,8 @@

           case JVM_CONSTANT_Dynamic:
             {
- oop result = constants->resolved_references()->obj_at(index);
- if (result == NULL) {
- CALL_VM(InterpreterRuntime::resolve_ldc(THREAD, (Bytecodes::Code) opcode), handle_exception);
- result = THREAD->vm_result();
- }
+ CALL_VM(InterpreterRuntime::resolve_ldc(THREAD, (Bytecodes::Code) opcode), handle_exception);
+ oop result = THREAD->vm_result();
               VERIFY_OOP(result);

               jvalue value;
@@ -2391,11 +2388,8 @@

           case JVM_CONSTANT_Dynamic:
             {
- oop result = constants->resolved_references()->obj_at(index);
- if (result == NULL) {
- CALL_VM(InterpreterRuntime::resolve_ldc(THREAD, (Bytecodes::Code) opcode), handle_exception);
- result = THREAD->vm_result();
- }
+ CALL_VM(InterpreterRuntime::resolve_ldc(THREAD, (Bytecodes::Code) opcode), handle_exception);
+ oop result = THREAD->vm_result();
               VERIFY_OOP(result);