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Implement patchable GCR guards on all architectures #9730

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@0xdaryl

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@0xdaryl

Patchable GCR guards are only implemented on x86, and are believed to realize a non-negligible performance improvement when enabled.

The performance impact should be measured, and they should be implemented on

  • Power
  • Z
  • AArch64
  • ARM

if they are beneficial.

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