Continued work on 64-bit shifts in core registers. This has now been
posted to gcc-patches, and is awaiting review.
64-bit shifts in NEON are also working correctly, but the register
allocator chooses not to use them most of the time. I've begun trying to
work out why, but it's quite involved in ira-costs.c and will take some
unpicking, I think.
Attempted to create a Linaro GCC 4.7 branch, but my test build failed,
so that'll have to wait until it's stabilized a little.
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