Fix assertions generation for substituted members

compiler/testData/codegen/notNullAssertions/arrayListGet.kt

@@ -0,0 +1,9 @@
+import java.util.ArrayList
+
+fun foo() {
+    val a = ArrayList<String>()
+    a.get(0)
+}
+
+fun bar(a: ArrayList<String>) {
+}

compiler/testData/codegen/notNullAssertions/javaMultipleSubstitutions.java

@@ -0,0 +1,18 @@
+import org.jetbrains.annotations.NotNull;
+
+class A<T, U> {
+    @NotNull
+    T foo() { return null; }
+}
+
+class B<T> extends A<T, Integer> {
+    @Override
+    @NotNull
+    T foo() { return null; }
+}
+
+class C extends B<String> {
+    @Override
+    @NotNull
+    String foo() { return null; }
+}

compiler/testData/codegen/notNullAssertions/javaMultipleSubstitutions.kt

@@ -0,0 +1,5 @@
+fun bar(a: A<String, Int>, b: B<String>, c: C) {
+    val sa: String = a.foo()
+    val sb: String = b.foo()
+    val sc: String = c.foo()
+}