I've gone through and checked the 64 bit operation improvements that
Andrew has made to GCC.  For everything but the Cortex-A8, GCC uses
the NEON unit for 64 bit operations and Andrew's improvements mean we
can stay on NEON for longer without having an expensive transfer back
and forth to the core registers.

The results are here:
 https://wiki.linaro.org/MichaelHope/Sandbox/64BitOperations

Once we've fixed the shift-left-by-n pattern I'll turn this into an
Outputs[1] page.

Benchmark results have been sent to the linaro-toolchain-benchmarks list.

-- Michael

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