[llvm-commits] PATCH: Add encodings for fxsave64 and fxrstor64

[Reid Kleckner]

These instructions are just fxsave and fxrstor with REX_W prefixes.
The difference is that some pointers in dumped register map come out
as 64-bit values instead of 32-bit values.  If you don't use the
prefix in 64-bit mode, you'll get 32-bit values instead of 64-bit.

I needed this patch to build DynamoRIO with clang with the integrated
assembler.  It has some inline assembly with these instructions for
context switching on signals.

Please review.  I can commit the patch.

Thanks,
Reid
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