CVS log for src/common/lib/libc/arch/mips/atomic/atomic_or.S

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Keyword substitution: kv
Default branch: MAIN

Centralise SYNC/BDSYNC in asm.h and introduce a new LLCSCSYNC and use it
before any ll/sc sequences.

Define LLSCSYNC as syncw; syncw for cnMIPS - issue two as early cnMIPS
has errat{um,a} that means the first can fail.

Trailing whitespace

Ooops, restore accidently removed files from merge mishap

Sync with HEAD

sync with head

don't include <sys/cdefs.h> from assembly.

loongson2f support:
- Add some loongson2 definitions to cpuregs.h, from OpenBSD
- Make sure that the at register is useable before every jump register
  instruction (exept when register is k0 or k1) because -mfix-loongson2f-btb
  needs the at register for its workaround
- add code to mips_fixup.c to handle the instructions added by
  -mfix-loongson2f-btb
- Add a ls2-specific tlb miss handler: it doesn't have separate handler
  for the xtlbmiss exeption.
- Fixes for some #ifdef MIPS3_LOONGSON2 assembly code (using the wrong
  register)

Merge from matt-nb5-mips64

Add native ll/sc or lld/scd versions of the atomic ops.

file atomic_or.S was initially added on branch matt-nb5-mips64.