Fixed ldind failure and properly zext unsigned types in WebAssembly

src/ILCompiler.WebAssembly/src/CodeGen/ILToWebAssemblyImporter.cs

@@ -395,6 +395,10 @@ private static LLVMValueRef CastIntValue(LLVMBuilderRef builder, LLVMValueRef va
             {
                 return LLVM.BuildSExtOrBitCast(builder, value, type, "SExtOrBitCast");
             }
+            else if (type.GetIntTypeWidth() > LLVM.TypeOf(value).GetIntTypeWidth())
+            {
+                return LLVM.BuildZExtOrBitCast(builder, value, type, "ZExtOrBitCast");
+            }
             else
             {
                 Debug.Assert(typeKind == LLVMTypeKind.LLVMIntegerTypeKind);
@@ -1569,7 +1573,7 @@ private void ImportLoadIndirect(TypeDesc type)
 
             LLVMValueRef pointerElementType = pointer.ValueAsType(type.MakePointerType(), _builder);
             _stack.Push(new LoadExpressionEntry(type != null ? GetStackValueKind(type) : StackValueKind.ByRef, "ldind",
-                pointerElementType, type.MakePointerType()));
+                pointerElementType, type));
         }
 
         private void ImportStoreIndirect(int token)

tests/src/Simple/HelloWasm/Program.cs

@@ -205,6 +205,8 @@ private static unsafe void Main(string[] args)
         {   
             PrintLine("Type casting with isinst & castclass to array test: Ok.");
         }
+
+        ldindTest();
 
         PrintLine("Done");
     }
@@ -305,6 +307,35 @@ private static void IntToStringTest()
         PrintLine(intString);
     }
 
+    private unsafe static void ldindTest()
+    {
+        var ldindTarget = new TwoByteStr { first = byte.MaxValue, second = byte.MinValue };
+        var ldindField = &ldindTarget.first;
+        if((*ldindField) == byte.MaxValue)
+        {
+            ldindTarget.second = byte.MaxValue;
+            *ldindField = byte.MinValue;
+            //ensure there isnt any overwrite of nearby fields
+            if(ldindTarget.first == byte.MinValue && ldindTarget.second == byte.MaxValue)
+            {
+                PrintLine("ldind test: Ok.");
+            }
+            else if(ldindTarget.first != byte.MinValue)
+            {
+                PrintLine("ldind test: Failed didnt update target.");
+            }
+            else
+            {
+                PrintLine("ldind test: Failed overwrote data");
+            }
+        }
+        else
+        {
+            uint ldindFieldValue = *ldindField;
+            PrintLine("ldind test: Failed." + ldindFieldValue.ToString());
+        }
+    }
+
     [DllImport("*")]
     private static unsafe extern int printf(byte* str, byte* unused);
 }