deps: cherry-pick bfae9db from upstream v8

Original commit message:

    Update postmortem metadata generator.

    Add PropertyDetails::AttributesField +
    PropertyDetails::LocationField.

    Review-Url: https://codereview.chromium.org/2842843004
    Cr-Commit-Position: refs/heads/master@{#44889}

PR-URL: https://github.com/nodejs/node/pull/12722
Refs: https://github.com/nodejs/llnode/issues/81
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

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

@@ -99,6 +99,22 @@ consts_misc = [
         'value': 'kAccessor' },
     { 'name': 'prop_kind_mask',
         'value': 'PropertyDetails::KindField::kMask' },
+    { 'name': 'prop_location_Descriptor',
+        'value': 'kDescriptor' },
+    { 'name': 'prop_location_Field',
+        'value': 'kField' },
+    { 'name': 'prop_location_mask',
+        'value': 'PropertyDetails::LocationField::kMask' },
+    { 'name': 'prop_location_shift',
+        'value': 'PropertyDetails::LocationField::kShift' },
+    { 'name': 'prop_attributes_NONE', 'value': 'NONE' },
+    { 'name': 'prop_attributes_READ_ONLY', 'value': 'READ_ONLY' },
+    { 'name': 'prop_attributes_DONT_ENUM', 'value': 'DONT_ENUM' },
+    { 'name': 'prop_attributes_DONT_DELETE', 'value': 'DONT_DELETE' },
+    { 'name': 'prop_attributes_mask',
+        'value': 'PropertyDetails::AttributesField::kMask' },
+    { 'name': 'prop_attributes_shift',
+        'value': 'PropertyDetails::AttributesField::kShift' },
     { 'name': 'prop_index_mask',
         'value': 'PropertyDetails::FieldIndexField::kMask' },
     { 'name': 'prop_index_shift',