test: update postmortem metadata test

This commit updates the following postmortem metadata constants:

- v8dbg_class_Map__inobject_properties_or_constructor_function_index__int
  - This is now
    v8dbg_class_Map__inobject_properties_start_or_constructor_function_index__char
    as of
    v8/v8@61bf2cc
- v8dbg_class_Map__instance_attributes__int
  - This is now v8dbg_class_Map__instance_type__uint16_t as of
    v8/v8@c00bb6d
    and
    v8/v8@cb46310
- v8dbg_class_Map__instance_size__int
  - This is now v8dbg_class_Map__instance_size_in_words__char as of
    v8/v8@61bf2cc

Refs: nodejs/node-v8#34

Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

test/parallel/test-postmortem-metadata.js

@@ -37,6 +37,10 @@ assert.strictEqual(missing.length, 0, `Missing constants: ${missing}`);
 // pushed to the bottom of the file for improved readability.
 function getExpectedSymbols() {
   return [
+    // Disable the maximum line length for the remainder of the file since it
+    // should only consist of postmortem constants, and some of them can be
+    // relatively long.
+    /* eslint-disable max-len */
     'v8dbg_bit_field3_dictionary_map_shift',
     'v8dbg_bit_field3_number_of_own_descriptors_shift',
     'v8dbg_class_Code__instruction_size__int',
@@ -64,10 +68,10 @@ function getExpectedSymbols() {
     'v8dbg_class_JSRegExp__source__Object',
     'v8dbg_class_Map__bit_field3__int',
     'v8dbg_class_Map__constructor_or_backpointer__Object',
-    'v8dbg_class_Map__inobject_properties_or_constructor_function_index__int',
-    'v8dbg_class_Map__instance_attributes__int',
+    'v8dbg_class_Map__inobject_properties_start_or_constructor_function_index__char',
+    'v8dbg_class_Map__instance_type__uint16_t',
     'v8dbg_class_Map__instance_descriptors__DescriptorArray',
-    'v8dbg_class_Map__instance_size__int',
+    'v8dbg_class_Map__instance_size_in_words__char',
     'v8dbg_class_Oddball__kind_offset__int',
     'v8dbg_class_Script__line_ends__Object',
     'v8dbg_class_Script__line_offset__SMI',