[java] inline method: keep side effects free single returns (IDEA-280791)

avoid generating red code though when return value won't be a valid statement on its own

GitOrigin-RevId: ad768417d454192680b8d6692d8e1037b3ee9308

java/java-tests/testData/refactoring/inlineMethod/EmptyMethod.java

@@ -0,0 +1,8 @@
+class A {
+    {
+        g();
+    }
+    int <caret>g() {
+        return new Integer(0);
+    }
+}