deps: update postmortem metadata generation script

Update postmortem metadata constants for V8 7.4 in Node.js.

PR-URL: #26685
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>

Author: cjihrig

common.gypi

@@ -37,7 +37,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.11',
+    'v8_embedder_string': '-node.12',
 
     ##### V8 defaults for Node.js #####
 

deps/v8/tools/gen-postmortem-metadata.py

@@ -85,6 +85,10 @@
     { 'name': 'SmiTagMask',             'value': 'kSmiTagMask' },
     { 'name': 'SmiValueShift',          'value': 'kSmiTagSize' },
     { 'name': 'SmiShiftSize',           'value': 'kSmiShiftSize' },
+    { 'name': 'SystemPointerSize',      'value': 'kSystemPointerSize' },
+    { 'name': 'SystemPointerSizeLog2',  'value': 'kSystemPointerSizeLog2' },
+    { 'name': 'TaggedSize',             'value': 'kTaggedSize' },
+    { 'name': 'TaggedSizeLog2',         'value': 'kTaggedSizeLog2' },
 
     { 'name': 'OddballFalse',           'value': 'Oddball::kFalse' },
     { 'name': 'OddballTrue',            'value': 'Oddball::kTrue' },
@@ -161,6 +165,8 @@
         'value': 'Map::NumberOfOwnDescriptorsBits::kMask' },
     { 'name': 'bit_field3_number_of_own_descriptors_shift',
         'value': 'Map::NumberOfOwnDescriptorsBits::kShift' },
+    { 'name': 'class_Map__instance_descriptors_offset',
+        'value': 'Map::kDescriptorsOffset' },
 
     { 'name': 'off_fp_context_or_frame_type',
         'value': 'CommonFrameConstants::kContextOrFrameTypeOffset'},