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Cr50 lacks native instructions for 64-bit integers and an ABI function can be used by the compiler to take the place of the needed instructions. This CL adds support for a right bitwise shift of 64-bit integers. BRANCH=none BUG=chromium:794010 TEST=Set CONFIG_LLSR_TEST, build, update cr50, and run llsrtest on the console. Change-Id: Iae66c86720c531454ba29f15b3cc6a07959f5ef2 Signed-off-by: Allen Webb <allenwebb@google.com> Reviewed-on: https://chromium-review.googlesource.com/931932 Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>