Also test for __AARCH64EB__ as well as __ARMEB__ for big-endian.

Move the definitions of ntohl() and friends into sys/endian.h where they
are defined in terms of bswap32() and bswap16().
This makes the definition be in the same place for all systems regardless
of

Move the definitions of ntohl() and friends into sys/endian.h where they
are defined in terms of bswap32() and bswap16().
This makes the definition be in the same place for all systems regardless
of creed^Wendianness.

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merge ktrace-lwp.

Reflect <sys/endian.h> rev. 1.4: make htonl() et al. arguments and
results uint{16,32}_t. Noted by Ian Zagorskih.

* Rename "word" -> 16, and "long" -> 32, as suggested by Ben Harris.
* Replace __byte_swap_32_variable() with a C version from Richard
Earnshaw that generates nearly identical assembly (and it woul

* Rename "word" -> 16, and "long" -> 32, as suggested by Ben Harris.
* Replace __byte_swap_32_variable() with a C version from Richard
Earnshaw that generates nearly identical assembly (and it would be
exactly identical with the addition of another peephole to GCC ARM
back-end).

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Byte-swapping optimizations, enabled if compiling with GCC:
* Byte-swap 16-bit and 32-bit constants at compile-time.
* Inline 16-bit and 32-bit variable byte-swaps. These take 3 and 4
insns, respe

Byte-swapping optimizations, enabled if compiling with GCC:
* Byte-swap 16-bit and 32-bit constants at compile-time.
* Inline 16-bit and 32-bit variable byte-swaps. These take 3 and 4
insns, respectively, and inlining saves the minimum 6 cycle penalty
to call/return from the byte swap function.

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Re-introduce <arm/endian_machdep.h>, this time using GCC's idea of the target
endianness.

Header files which don't differ between arm32 and arm26 and can thus be
shared.