Add diagnostics to test data from NI

compiler/testData/diagnostics/tests/overload/defaultParameters.kt

@@ -55,5 +55,5 @@ fun test() {
 
     withGenericDefaults("")
 
-    <!UNREACHABLE_CODE!><!OVERLOAD_RESOLUTION_AMBIGUITY!>wrong<!>(<!>null!!<!UNREACHABLE_CODE!>)<!>
+    <!OI;UNREACHABLE_CODE!><!OVERLOAD_RESOLUTION_AMBIGUITY!>wrong<!>(<!>null!!<!OI;UNREACHABLE_CODE!>)<!>
 }

compiler/testData/diagnostics/tests/overload/kt2493.kt

@@ -16,5 +16,5 @@ class C: A, B
 fun main(args: Array<String>) {
     AImpl().f()
     BImpl().f()
-    C().<!CANNOT_COMPLETE_RESOLVE!>f<!>()
+    C().<!NI;OVERLOAD_RESOLUTION_AMBIGUITY, OI;CANNOT_COMPLETE_RESOLVE!>f<!>()
 }