arm64: Add Armv8.3-A PAC support to assembly files
This patch adds optional support for Arm Pointer Authentication Codes. PAC support is turned on or off at compile time using additional compiler flags. Unless any of these is enabled explicitly, no additional code will be emitted at all. Signed-off-by:André Kempe <andre.kempe@arm.com> Signed-off-by:
Martin Storsjö <martin@martin.st>
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