Define target-specific {raw,this}_cpu_try_cmpxchg64() and
{raw,this}_cpu_try_cmpxchg128() macros. These definitions override
the generic fallback definitions and enable target-specific
optimized implementations.

Several places in mm/slub.o improve from e.g.:

    53bc:	48 8d 4f 40          	lea    0x40(%rdi),%rcx
    53c0:	48 89 fa             	mov    %rdi,%rdx
    53c3:	49 8b 5c 05 00       	mov    0x0(%r13,%rax,1),%rbx
    53c8:	4c 89 e8             	mov    %r13,%rax
    53cb:	49 8d 30             	lea    (%r8),%rsi
    53ce:	e8 00 00 00 00       	call   53d3 <...>
			53cf: R_X86_64_PLT32	this_cpu_cmpxchg16b_emu-0x4
    53d3:	48 31 d7             	xor    %rdx,%rdi
    53d6:	4c 31 e8             	xor    %r13,%rax
    53d9:	48 09 c7             	or     %rax,%rdi
    53dc:	75 ae                	jne    538c <...>

to:

    53bc:	48 8d 4a 40          	lea    0x40(%rdx),%rcx
    53c0:	49 8b 1c 07          	mov    (%r15,%rax,1),%rbx
    53c4:	4c 89 f8             	mov    %r15,%rax
    53c7:	48 8d 37             	lea    (%rdi),%rsi
    53ca:	e8 00 00 00 00       	call   53cf <...>
			53cb: R_X86_64_PLT32	this_cpu_cmpxchg16b_emu-0x4
    53cf:	75 bb                	jne    538c <...>

reducing the size of mm/slub.o by 80 bytes:

   text    data     bss     dec     hex filename
  39758    5337    4208   49303    c097 slub-new.o
  39838    5337    4208   49383    c0e7 slub-old.o
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230906185941.53527-1-ubizjak@gmail.com