Modify analysis for property initializer. Add errors about delegated property accessors.

compiler/testData/diagnostics/tests/delegatedProperty/absentErrorAboutInitializer.kt

@@ -0,0 +1,8 @@
+val a: Int by Delegate()
+
+class Delegate {
+  fun get(t: Any?, p: String): Int {
+    t.equals(p) // to avoid UNUSED_PARAMETER warning
+    return 1
+  }
+}