test: update postmortem metadata test for V8 7.0

The V8 7.0 update requires the following adjustments to the
postmortem debugging metadata constants:

- v8dbg_class_SharedFunctionInfo__script__Object
  Use: v8dbg_class_SharedFunctionInfo__script_or_debug_info__Object

- v8dbg_class_SharedFunctionInfo__function_identifier_or_debug_info__Object
  Use: v8dbg_class_UncompiledData__inferred_name__String and
       v8dbg_class_SharedFunctionInfo__name_or_scope_info__Object

Refs: v8/v8@c941f11

PR-URL: #22754
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

test/v8-updates/test-postmortem-metadata.js

@@ -96,10 +96,10 @@ function getExpectedSymbols() {
     'v8dbg_class_SharedFunctionInfo__function_data__Object',
     'v8dbg_class_SharedFunctionInfo__flags__int',
     'v8dbg_class_UncompiledData__end_position__int32_t',
-    'v8dbg_class_SharedFunctionInfo__function_identifier_or_debug_info__Object',
+    'v8dbg_class_UncompiledData__inferred_name__String',
     'v8dbg_class_SharedFunctionInfo__internal_formal_parameter_count__uint16_t',
     'v8dbg_class_SharedFunctionInfo__name_or_scope_info__Object',
-    'v8dbg_class_SharedFunctionInfo__script__Object',
+    'v8dbg_class_SharedFunctionInfo__script_or_debug_info__Object',
     'v8dbg_class_UncompiledData__start_position__int32_t',
     'v8dbg_class_SlicedString__offset__SMI',
     'v8dbg_class_SlicedString__parent__String',