FIR: Rework loading overrides of special built-in methods from Java

Some of the changed data is correct, but some diagnostics are incorrect
Corner cases like having both contains(Object) and contains(String)
within implementation of Collection<String> is not supported

compiler/testData/diagnostics/tests/j+k/collectionOverrides/removeAtInt.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // JAVAC_EXPECTED_FILE
 // FILE: A.java
 abstract public class A extends B {