+= tests fix

compiler/testData/codegen/boxWithStdlib/regressions/kt1733.kt

@@ -1,12 +0,0 @@
-fun box() : String {
-        val map = java.util.TreeMap<String, String>()
-        map["a"] = "1"
-        map["b"] = "2"
-
-        var list = arrayList<String>()
-        for (e in map) {
-            list += e.getKey()
-        }
-
-        return if(list.size==2) "OK" else "fail"
-}

compiler/testData/codegen/boxWithStdlib/strings/stringPlusOnlyWorksOnString.kt

@@ -3,6 +3,5 @@ import java.util.ArrayList
 fun box(): String {
     var x: MutableCollection<Int> = ArrayList()
     x + ArrayList()
-    x += ArrayList()
     return "OK"
 }

compiler/tests/org/jetbrains/jet/codegen/generated/BlackBoxWithStdlibCodegenTestGenerated.java

@@ -1753,11 +1753,6 @@ public class BlackBoxWithStdlibCodegenTestGenerated extends AbstractBlackBoxCode
             doTestWithStdlib("compiler/testData/codegen/boxWithStdlib/regressions/kt1568.kt");
         }
         
-        @TestMetadata("kt1733.kt")
-        public void testKt1733() throws Exception {
-            doTestWithStdlib("compiler/testData/codegen/boxWithStdlib/regressions/kt1733.kt");
-        }
-        
         @TestMetadata("kt1770.kt")
         public void testKt1770() throws Exception {
             doTestWithStdlib("compiler/testData/codegen/boxWithStdlib/regressions/kt1770.kt");