move the float definitions all into <sparc/float.h> and make that
version work in either 32 or 64 bit mode.

merge ktrace-lwp.

* Move the definitions for types other than single-precision and double-
precision back to machine-dependent headers. C99 has no strict
requirement which, if any, extended-precision type `long d

* Move the definitions for types other than single-precision and double-
precision back to machine-dependent headers. C99 has no strict
requirement which, if any, extended-precision type `long double' must
match, and even between 80-bit formats there are differences in
implementation (m68k vs. x86).
* On arm, consider __VFP_FP__.

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Rename <sys/float_ieee.h> to <sys/float_ieee754.h>, following libc's
convention for these.

PR/3012: Greg A. Woods: Write all float.h files [except the vax of course]
in terms of float_ieee.h

Define proper constants for 128-bit floating point.

merge cosmetic differences from sparc port.

Import of sparc64.