switch statement issues invalid opcode=switch

[pengzeshan]

here is a simple csharp program for triggering the issue:
namespace ConsoleApp1
{
class Program
{
static void Main(string[] args){}
public char GetID(int value)
{
char toRet = ' ';
switch (value)
{
case 1:
toRet = 'a';
break;
case 4:
default:
toRet = 'b';
break;
}
return toRet;
}
}
}

Here is the error message:
Severity Code Description Project File Line Suppression State
Error MSB4018 The "Translate" task failed unexpectedly.
IL2C.InvalidProgramSequenceException: Invalid opcode: Method=ConsoleApp1.Program.GetID(System.Int32), OpCode=switch, Offset=11
at IL2C.AssemblyPreparer.d__1.MoveNext() in C:\cygwin\home\damon.peng\workspace\workForCH\dotNet\IL2C\IL2C.Core\AssemblyPreparer.cs:line 64
at System.Linq.Enumerable.WhereSelectEnumerableIterator2.MoveNext() at System.Linq.Enumerable.<SelectManyIterator>d__172.MoveNext()
at System.Linq.Buffer1..ctor(IEnumerable1 source)
at System.Linq.OrderedEnumerable1.<GetEnumerator>d__1.MoveNext() at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable1 source, Func2 keySelector, Func2 elementSelector, IEqualityComparer1 comparer) at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable1 source, Func2 keySelector, Func2 elementSelector)
at IL2C.AssemblyPreparer.PrepareMethodBody(IPrepareContext prepareContext, IMethodInformation method) in C:\cygwin\home\damon.peng\workspace\workForCH\dotNet\IL2C\IL2C.Core\AssemblyPreparer.cs:line 134
at IL2C.AssemblyPreparer.PrepareMethod(IPrepareContext prepareContext, IMethodInformation method) in C:\cygwin\home\damon.peng\workspace\workForCH\dotNet\IL2C\IL2C.Core\AssemblyPreparer.cs:line 256
at IL2C.AssemblyPreparer.<>c__DisplayClass5_0.b__4(<>f__AnonymousType12 <>h__TransparentIdentifier0) in C:\cygwin\home\damon.peng\workspace\workForCH\dotNet\IL2C\IL2C.Core\AssemblyPreparer.cs:line 310 at System.Linq.Enumerable.WhereSelectEnumerableIterator2.MoveNext()
at System.Linq.Enumerable.WhereSelectEnumerableIterator2.MoveNext() at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable1 source, Func2 keySelector, Func2 elementSelector, IEqualityComparer1 comparer) at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable1 source, Func2 keySelector, Func2 elementSelector)
at IL2C.AssemblyPreparer.Prepare(TranslateContext translateContext, Func2 predictType, Func2 predictMethod) in C:\cygwin\home\damon.peng\workspace\workForCH\dotNet\IL2C\IL2C.Core\AssemblyPreparer.cs:line 305
at IL2C.AssemblyPreparer.Prepare(TranslateContext translateContext) in C:\cygwin\home\damon.peng\workspace\workForCH\dotNet\IL2C\IL2C.Core\AssemblyPreparer.cs:line 320
at IL2C.SimpleDriver.Translate(TextWriter logw, CodeTextStorage storage, Boolean readSymbols, Boolean enableBundler, TargetPlatforms targetPlatform, DebugInformationOptions debugInformationOptions, String assemblyPath) in C:\cygwin\home\damon.peng\workspace\workForCH\dotNet\IL2C\IL2C.Core\SimpleDriver.cs:line 39
at IL2C.SimpleDriver.TranslateAll(TextWriter logw, String outputPath, Boolean readSymbols, Boolean enableCpp, Boolean enableBundler, TargetPlatforms targetPlatform, DebugInformationOptions debugInformationOptions, IEnumerable`1 assemblyPaths) in C:\cygwin\home\damon.peng\workspace\workForCH\dotNet\IL2C\IL2C.Core\SimpleDriver.cs:line 121
at IL2C.SimpleDriver.TranslateAll(TextWriter logw, String outputPath, Boolean readSymbols, Boolean enableCpp, Boolean enableBundler, TargetPlatforms targetPlatform, DebugInformationOptions debugInformationOptions, String[] assemblyPaths) in C:\cygwin\home\damon.peng\workspace\workForCH\dotNet\IL2C\IL2C.Core\SimpleDriver.cs:line 142
at IL2C.Translate.Execute() in D:\PROJECT\IL2C\IL2C.Tasks\Translate.cs:line 86
at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
at Microsoft.Build.BackEnd.TaskBuilder.d__26.MoveNext() ConsoleApp1 C:\Users\damon.peng.nuget\packages\il2c.build\0.4.113\build\IL2C.Build.targets 19

here is the il2c.build version: .4.113