Revert "[vm/ffi] FFI callbacks on X64."

This reverts commit be209f7846e8db8ad6512f3a0d7681b2d14bced1.

Reason for revert: failures on dartkb and windows bots

Original change's description:
> [vm/ffi] FFI callbacks on X64.
> 
> For context on the design, see go/dart-ffi-callbacks
> 
> Change-Id: I2482e3c932e73f9a4c00fa7e218ff85f9328fc51
> Cq-Include-Trybots: luci.dart.try:vm-kernel-linux-debug-simdbc64-try, vm-kernel-linux-release-simdbc64-try, vm-kernel-mac-debug-simdbc64-try, vm-kernel-mac-release-simdbc64-try, vm-kernel-reload-mac-debug-simdbc64-try, vm-kernel-reload-mac-release-simdbc64-try, vm-kernel-linux-debug-ia32-try, vm-dartkb-linux-debug-simarm64-try
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/100240
> Commit-Queue: Samir Jindel <sjindel@google.com>
> Reviewed-by: Daco Harkes <dacoharkes@google.com>

TBR=sjindel@google.com,ajcbik@google.com,dacoharkes@google.com

Change-Id: I4cb3d93675d68a51ac9e125ad1d572c47e8b5903
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Cq-Include-Trybots: luci.dart.try:vm-kernel-linux-debug-simdbc64-try, vm-kernel-linux-release-simdbc64-try, vm-kernel-mac-debug-simdbc64-try, vm-kernel-mac-release-simdbc64-try, vm-kernel-reload-mac-debug-simdbc64-try, vm-kernel-reload-mac-release-simdbc64-try, vm-kernel-linux-debug-ia32-try, vm-dartkb-linux-debug-simarm64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/102983
Reviewed-by: Samir Jindel <sjindel@google.com>
Commit-Queue: Samir Jindel <sjindel@google.com>
44 files changed
tree: fc7dd26245301e8e5da29640a61ce20615aaa16d
  1. .github/
  2. build/
  3. client/
  4. docs/
  5. pkg/
  6. runtime/
  7. samples/
  8. samples-dev/
  9. sdk/
  10. tests/
  11. third_party/
  12. tools/
  13. utils/
  14. .clang-format
  15. .gitattributes
  16. .gitconfig
  17. .gitignore
  18. .gn
  19. .mailmap
  20. .packages
  21. .vpython
  22. AUTHORS
  23. BUILD.gn
  24. CHANGELOG.md
  25. codereview.settings
  26. CONTRIBUTING.md
  27. DEPS
  28. LICENSE
  29. PATENTS
  30. PRESUBMIT.py
  31. README.dart-sdk
  32. README.md
  33. WATCHLISTS
README.md

Dart

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