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[AArch64] Add v8.5-a Memory Tagging GMID_EL1 register

Description

[AArch64] Add v8.5-a Memory Tagging GMID_EL1 register

The latest version of the MTE spec added a system
register 'GMID_EL1'. It contains the block size used
by the LDGM and STGM instructions and is read only.

The specification can be found here:
https://developer.arm.com/docs/ddi0596/c

Details

Committed
DavidSpickettApr 1 2019, 7:41 AM
Parents
rL357391: Fix builder.
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