Eliminate GetStackType() for cecil type references; it was incorrect for arrays of enums.

ICSharpCode.Decompiler/IL/ILReader.cs

@@ -59,6 +59,7 @@ namespace ICSharpCode.Decompiler.IL
 		}
 
 		Cil.MethodBody body;
+		StackType methodReturnStackType;
 		BlobReader reader;
 		ImmutableStack<ILVariable> currentStack;
 		ILVariable[] parameterVariables;
@@ -80,6 +81,7 @@ namespace ICSharpCode.Decompiler.IL
 			this.reader = body.GetILReader();
 			this.currentStack = ImmutableStack<ILVariable>.Empty;
 			this.unionFind = new UnionFind<ILVariable>();
+			this.methodReturnStackType = typeSystem.Resolve(body.Method.ReturnType).GetStackType();
 			InitParameterVariables();
 			this.localVariables = body.Variables.SelectArray(CreateILVariable);
 			if (body.InitLocals) {
@@ -903,11 +905,10 @@ namespace ICSharpCode.Decompiler.IL
 		
 		private ILInstruction Return()
 		{
-			var stackType = body.Method.ReturnType.GetStackType();
-			if (stackType == StackType.Void)
+			if (methodReturnStackType == StackType.Void)
 				return new IL.Return();
 			else
-				return new IL.Return(Pop(stackType));
+				return new IL.Return(Pop(methodReturnStackType));
 		}
 
 		private ILInstruction DecodeLdstr()

ICSharpCode.Decompiler/IL/ILTypeExtensions.cs

@@ -28,33 +28,6 @@ namespace ICSharpCode.Decompiler.IL
 {
 	static class ILTypeExtensions
 	{
-		/*public static ImmutableArray<StackType> GetStackTypes(this TypeSignatureCollection typeSignatureCollection)
-		{
-			var result = new StackType[typeSignatureCollection.Count];
-			int i = 0;
-			foreach (var typeSig in typeSignatureCollection) {
-				result[i++] = GetStackType(typeSig);
-			}
-			return ImmutableArray.Create(result);
-		}*/
-
-		public static StackType GetStackType(this TypeReference typeRef)
-		{
-			typeRef = typeRef.SkipModifiers();
-			TypeDefinition typeDef = typeRef.Resolve();
-			if (typeDef != null && typeDef.IsEnum) {
-				typeRef = typeDef.GetEnumUnderlyingType();
-			}
-			return typeRef.MetadataType.GetStackType();
-		}
-
-		public static TypeReference SkipModifiers(this TypeReference typeRef)
-		{
-			while (typeRef.IsOptionalModifier || typeRef.IsRequiredModifier)
-				typeRef = ((IModifierType)typeRef).ElementType;
-			return typeRef;
-		}
-
 		public static StackType GetStackType(this MetadataType typeCode)
 		{
 			switch (typeCode) {