Extend the machine/ieeefp.h that was inherited from i386 to support the SSE mxcsr register as well.  Since gcc will intermix SSE2 and x87 FP code, the fpsetround() etc mode had better be the same.
Extend the machine/ieeefp.h that was inherited from i386 to support
the SSE mxcsr register as well.  Since gcc will intermix SSE2 and x87
FP code, the fpsetround() etc mode had better be the same.

There are hooks to enable these inlines to be instantiated inside libc
for non-gcc or C++ callers. (g++ doesn't like the inlines that tried
to extract an integer and convert it to an enum).

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