Use UTF8 instead of UTF16 for byte count

Author: Sleitnick

Editor/LuauImporter.cs

@@ -132,7 +132,7 @@ public static void ReimportAllLuau() {
 
         // Compile
         StopwatchCompile.Start();
-        var len = Encoding.Unicode.GetByteCount(data);
+        var len = Encoding.UTF8.GetByteCount(data);
         IntPtr res = LuauPlugin.LuauCompileCode(dataStr, len, filenameStr, ctx.assetPath.Length, 1);
         StopwatchCompile.Stop();
 

Runtime/Code/Luau/LuauCompiler.cs

@@ -38,7 +38,7 @@ public static void RuntimeCompile(string path, string data, AirshipScript airshi
         IntPtr dataStr = Marshal.StringToCoTaskMemUTF8(data); //Ok
 
         // Compile
-        var len = Encoding.Unicode.GetByteCount(data);
+        var len = Encoding.UTF8.GetByteCount(data);
         IntPtr res = LuauPlugin.LuauCompileCode(dataStr, len, filenameStr, path.Length, 1);
 
         Marshal.FreeCoTaskMem(dataStr);

Runtime/Code/Luau/LuauPlugin.cs

@@ -474,7 +474,7 @@ public static IntPtr LuauCreateThread(LuauContext context, byte[] scriptBytecode
 		var scriptBytecodePtr = scriptBytecodeHandle.AddrOfPinnedObject();
 
 		var filenamePtr = Marshal.StringToCoTaskMemUTF8(filename);
-		var filenameLength = Encoding.Unicode.GetByteCount(filename);
+		var filenameLength = Encoding.UTF8.GetByteCount(filename);
 
 		var returnValue = CreateThread(context, scriptBytecodePtr, scriptBytecode.Length, filenamePtr, filenameLength, gameObjectId, nativeCodegen);