inline variable: if def in assignment expr replace with def if not stmt

otherwise containing expression would miss a part (IDEA-152813)

java/java-tests/testData/refactoring/inlineLocal/DefInMultiAssignmentStatement.java

@@ -0,0 +1,8 @@
+class Test {
+    {
+        int i, j;
+        i = j = 0;
+        System.out.println(<caret>j);
+
+    }
+}