Lib: Fix field offsets on wasm. Closes #226

Author: SamboyCoding

LibCpp2IL/ClassReadingBinaryReader.cs

@@ -87,8 +87,6 @@ public long Position
             return null;
         }
 
-        private Dictionary<FieldInfo, bool> _cachedNoSerialize = new();
-
         public uint ReadUnityCompressedUIntAtRawAddr(long offset, out int bytesRead)
         {
             GetLockOrThrow();

LibCpp2IL/Il2CppBinary.cs

@@ -389,7 +389,7 @@ public int GetFieldOffsetFromIndex(int typeIndex, int fieldIndexInType, int fiel
                     {
                         var offsetOffset = (ulong)MapVirtualAddressToRaw(ptr) + 4ul * (ulong)fieldIndexInType;
                         Position = (long)offsetOffset;
-                        offset = ReadInt32();
+                        offset = (int)ReadPrimitive(typeof(int))!; //Read 4 bytes. We can't just use ReadInt32 because that breaks e.g. Wasm. Hoping the JIT can optimize this as it knows the type.
                     }
                 }
                 else