extract method from expression: declare necessary variables inside; reassign result when it was assigned before (IDEA-63593)

java/java-tests/testData/refactoring/extractMethod/ExtractAssignmentExpressionFromStatement.java

@@ -0,0 +1,7 @@
+
+class Foo {
+  void foo() {
+    int x = 0;
+    <selection>x = 1</selection>;
+  }
+}