remove assignment order restriction

analyzer.ml

@@ -446,10 +446,6 @@ module TexprFilter = struct
 						| TLocal v2 when v1 == v2 && not !affected ->
 							found := true;
 							e1
-						| TBinop((OpAssign | OpAssignOp _ as op),e1,e2) ->
-							let e2 = replace e2 in
-							let e1 = replace e1 in
-							{e with eexpr = TBinop(op,e1,e2)}
 						| TCall({eexpr = TLocal v},_) when is_unbound v ->
 							e
 						| _ ->

tests/optimization/src/TestJs.hx

@@ -539,6 +539,17 @@ class TestJs {
 		inlineCall(inlineCall(call(1, 2), stringField), inlineCall(stringField, call(5, 6)));
 	}
 
+	@:js('
+		var i = TestJs.getInt();
+		var a = TestJs.getArray();
+		a[i++] = i++;
+	')
+	static function testAssignmentSideEffect() {
+		var i = getInt();
+		var a = getArray();
+		a[i++] = i++;
+	}
+
 	static inline function inlineCall(d1:Dynamic, d2:Dynamic) {
 		return call(d2, d1);
 	}