introduce parameter: ensure type is substituted in overriders (IDEA-155609)

java/java-tests/testData/refactoring/introduceParameter/afterSubstituteTypeParamsInInheritor.java

@@ -0,0 +1,7 @@
+class A<T> {
+  void foo(final T anObject) {
+  }
+}
+class B extends A<String> {
+  void foo(final String anObject) {}
+}

java/java-tests/testData/refactoring/introduceParameter/beforeSubstituteTypeParamsInInheritor.java

@@ -0,0 +1,8 @@
+class A<T> {
+  void foo() {
+    T <selection>t</selection> = null;
+  }
+}
+class B extends A<String> {
+  void foo() {}
+}