[PA] Implement dynamically sized GigaCage (disabled)

This allows supporting the following scenarios (none of each is enabled
in this CL):

1. Lower the GigaCage size on 64-bit Windows <8.1, due to
   ERROR_COMMITMENT_LIMIT crashes. (See crbug.com/1217759)

2. Increase the GigaCage size on newer Windows where Courgette needs it,
   without increasing it on earlier versions. (See crbug.com/1286318)

3. Lower the GigaCage size on iOS for test runner, which can't get
   "Extended Virtual Addressing" entitlement. (Needed to tackle
   crbug.com/1250788)

Enabling dynamically sized GigaCage converts some constexpr to
variables. Not ideal, but we expect the perf impact to be negligible,
since the variables are placed in their own, write-once cacheline,
which we expect to be hot. This benchmarks suggests that there should be
no performance difference
https://quick-bench.com/q/I6aiDNT2zgLkU8h6ZXLNtDaTfVA

Change-Id: I28a077df6434f68cbcb2d3811ed0dc30d4782dce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3274408
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Benoit Lize <lizeb@chromium.org>
Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/main@{#973489}
6 files changed
tree: 2da57684f426a4c79a6a6c51a307482266876fd9
  1. android_webview/
  2. apps/
  3. ash/
  4. base/
  5. build/
  6. build_overrides/
  7. buildtools/
  8. cc/
  9. chrome/
  10. chromecast/
  11. chromeos/
  12. cloud_print/
  13. codelabs/
  14. components/
  15. content/
  16. courgette/
  17. crypto/
  18. dbus/
  19. device/
  20. docs/
  21. extensions/
  22. fuchsia/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. media/
  32. mojo/
  33. native_client_sdk/
  34. net/
  35. pdf/
  36. ppapi/
  37. printing/
  38. remoting/
  39. rlz/
  40. sandbox/
  41. services/
  42. skia/
  43. sql/
  44. storage/
  45. styleguide/
  46. testing/
  47. third_party/
  48. tools/
  49. ui/
  50. url/
  51. weblayer/
  52. .clang-format
  53. .clang-tidy
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitattributes
  57. .gitignore
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython
  62. .vpython3
  63. .yapfignore
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. ENG_REVIEW_OWNERS
  71. LICENSE
  72. LICENSE.chromium_os
  73. OWNERS
  74. PRESUBMIT.py
  75. PRESUBMIT_test.py
  76. PRESUBMIT_test_mocks.py
  77. README.md
  78. WATCHLISTS
README.md

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