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deps: v8: fix potential segfault in profiler

Rodrigo Muino Tomonari requested to merge github/fork/ofrobots/shp-fault into master

This change fixes a potential segfault in the sampling heap profiler. This landed as part of a larger change upstream (https://github.com/v8/v8/commit/ec952aaa68b12e8448c123b5252efa3afa440ceb). This is the minimal backport that avoids the segfault.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines
Affected core subsystem(s)

deps: v8

CI: https://ci.nodejs.org/job/node-test-pull-request/10165/ V8-CI: https://ci.nodejs.org/job/node-test-commit-v8-linux/918/

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