This enables supporting ARM64 for Chromium.

Bug b/115344057
Bug chromium:881334

Change-Id: I45020e826684c6fa6e663a90b75703193ad670c3
Reviewed-on: https://swiftshader-review.googlesource.com/c/21451Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>