test: update postmortem metadata test for V8 7.1

The V8 7.1 update requires the following adjustments to the
postmortem debugging metadata constants:

- v8dbg_class_JSArrayBuffer__byte_length__Object
  Use: v8dbg_class_JSArrayBuffer__byte_length__size_t

- v8dbg_class_JSArrayBufferView__raw_byte_length__Object
  Use: v8dbg_class_JSArrayBufferView__byte_length__size_t

- v8dbg_class_JSArrayBufferView__raw_byte_offset__Object
  Use: v8dbg_class_JSArrayBufferView__byte_offset__size_t

- v8dbg_class_String__length__SMI
  Use: v8dbg_class_String__length__int32_t

Refs: v8/v8@5cfe1a6
Refs: v8/v8@c7a0049

PR-URL: #23423
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Myles Borins <myles.borins@gmail.com>

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

@@ -69,10 +69,10 @@ function getExpectedSymbols() {
     'v8dbg_class_HeapObject__map__Map',
     'v8dbg_class_JSArray__length__Object',
     'v8dbg_class_JSArrayBuffer__backing_store__Object',
-    'v8dbg_class_JSArrayBuffer__byte_length__Object',
+    'v8dbg_class_JSArrayBuffer__byte_length__size_t',
     'v8dbg_class_JSArrayBufferView__buffer__Object',
-    'v8dbg_class_JSArrayBufferView__raw_byte_length__Object',
-    'v8dbg_class_JSArrayBufferView__raw_byte_offset__Object',
+    'v8dbg_class_JSArrayBufferView__byte_length__size_t',
+    'v8dbg_class_JSArrayBufferView__byte_offset__size_t',
     'v8dbg_class_JSDate__value__Object',
     'v8dbg_class_JSFunction__context__Context',
     'v8dbg_class_JSFunction__shared__SharedFunctionInfo',
@@ -103,7 +103,7 @@ function getExpectedSymbols() {
     'v8dbg_class_UncompiledData__start_position__int32_t',
     'v8dbg_class_SlicedString__offset__SMI',
     'v8dbg_class_SlicedString__parent__String',
-    'v8dbg_class_String__length__SMI',
+    'v8dbg_class_String__length__int32_t',
     'v8dbg_class_ThinString__actual__String',
     'v8dbg_context_idx_scope_info',
     'v8dbg_context_idx_prev',