test: rebuild nan tests with libc++ and libc++abi (#29281)

* test: re-enable nan test: typedarrays-test.js

Fixes #28414.

I've confirmed this fix wfm on Linux. Pushing into a PR to get CI to run
it out on Win and Mac platforms too.

* chore: clarify comment

* test: fix NAN test string alignment

* test: (wip) add ldflags, archive file for libc++

* test: (wip) add libc++ to CircleCI

* test: (wip) add llvm flags

* test: (wip) change ldflag syntax

* test: (wip) build libc++abi as static

* fix: correct ldflags

* test: add ld env

* fix: do not commit this

* test: add lld from src to circleci

* test: add lld link to ld

* chore: preserve third_party

* seems legit

* sam swears this works kinda sort of sometimes'
:

* build: add gn visibility patch

* chore: update patches

* build: check for flatten_relative_to = false

* build: upload zip files, add to release.js validation

* debug: what the hell gn

* build: add libcxx gni to lint ignore

Linting the file adjusted the licenses array, which only contains
one value, and causes the gn check to fail later

* build: also use nan-spec-runner flags on Windows

* build: add linked flags for win32 only

* build: build libc++ as source on win

* build: clean up patch, add -fPIC for IA32

* build: delete libcxx .a files from root

* build: rename libc++.zip, clean up upload per platform

* build: fix gni lint

* ci: add libcxx gen to circleci config

* build: correct libcxx-object syntax

Co-authored-by: Samuel Attard <sam@electronjs.org>

Co-authored-by: Charles Kerr <charles@charleskerr.com>
Co-authored-by: clavin <clavin@electronjs.org>
Co-authored-by: Samuel Attard <sattard@slack-corp.com>
Co-authored-by: PatchUp <73610968+patchup[bot]@users.noreply.github.com>
Co-authored-by: Samuel Attard <sam@electronjs.org>

build/zip_libcxx.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+from __future__ import print_function
+import os
+import subprocess
+import sys
+import zipfile
+
+def execute(argv):
+  try:
+    output = subprocess.check_output(argv, stderr=subprocess.STDOUT)
+    return output
+  except subprocess.CalledProcessError as e:
+    print(e.output)
+    raise e
+
+def get_object_files(base_path, archive_name):
+  archive_file = os.path.join(base_path, archive_name)
+  output = execute(['nm', '-g', archive_file]).decode('ascii')
+  object_files = set()
+  lines = output.split("\n")
+  for line in lines:
+    if line.startswith(base_path):
+      object_file = line.split(":")[0]
+      object_files.add(object_file)
+  return list(object_files) + [archive_file]
+
+def main(argv):
+  dist_zip, = argv
+  out_dir = os.path.dirname(dist_zip)
+  base_path_libcxx = os.path.join(out_dir, 'obj/buildtools/third_party/libc++')
+  base_path_libcxxabi = os.path.join(out_dir, 'obj/buildtools/third_party/libc++abi')
+  object_files_libcxx = get_object_files(base_path_libcxx, 'libc++.a')
+  object_files_libcxxabi = get_object_files(base_path_libcxxabi, 'libc++abi.a')
+  with zipfile.ZipFile(
+      dist_zip, 'w', zipfile.ZIP_DEFLATED, allowZip64=True
+    ) as z:
+      object_files_libcxx.sort()
+      for object_file in object_files_libcxx:
+        z.write(object_file, os.path.relpath(object_file, base_path_libcxx))
+      for object_file in object_files_libcxxabi:
+        z.write(object_file, os.path.relpath(object_file, base_path_libcxxabi))
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv[1:]))