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H A Dcortex_a76.Sd0d115e21428295c0f63cab9f38a7b2de8104242 Thu Mar 07 14:33:02 UTC 2019 Ambroise Vincent <ambroise.vincent@arm.com> Cortex-A76: Optimize CVE_2018_3639 workaround

Switched from a static check to a runtime assert to make sure a
workaround is implemented for CVE_2018_3639.

This allows platforms that know they have the SSBS hardware workaround
in the CPU to compile out code under DYNAMIC_WORKAROUND_CVE_2018_3639.

The gain in memory size without the dynamic workaround is 4KB in bl31.

Change-Id: I61bb7d87c59964b0c7faac5d6bc7fc5c4651cbf3
Signed-off-by: Ambroise Vincent <ambroise.vincent@arm.com>