Small PIC Fixes

[ehem+grub]

Perhaps not the biggest deal, but I do like to get low-hanging fixes out
of the way if they appear.

One very significant item I found. It appears GCC is fine with %rbx being
clobbered when building PIC in 64-bit mode, even though it has problems
with %ebx being clobbered when building PIC in 32-bit mode.

One other item I did notice. Are there really any processors in the amd64
class that *don't* support CPUID? I'd like to hardcode
grub_cpu_is_cpuid_supported() to return 1 if __x86_64__ is defined, but
I'm a tad worried I'll be unpleasantly surprised.


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pic.diff
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