arm64: Check for MTE tag failures on kernel entry
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Authored by andrew on Thu, Mar 19, 4:06 PM.

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manu

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arm64

Summary

When entering the kernel from userspace we need to check for MTE tag
failures when using asynchronous MTE. This is done by checking if either
tag fault check types that have asynchronous checks are enabled, and
if so check the register the result is stored. It then sets a flag the
kernel can later use to raise a signal.