x86-64: Use __glibc_likely/__glibc_likely in dl-machine.h

The differences in elf/dl-reloc.os are

--- before    	2018-02-05 03:52:32.803125207 -0800
+++ after     	2018-02-05 03:52:14.913711879 -0800
@@ -1129,7 +1129,7 @@ _dl_relocate_object:
 	leaq	__PRETTY_FUNCTION__.9767(%rip), %rcx
 	leaq	.LC11(%rip), %rsi
 	leaq	.LC12(%rip), %rdi
-	movl	$540, %edx
+	movl	$539, %edx
 	call	__GI___assert_fail
 	.p2align 4,,10
 	.p2align 3

	* sysdeps/x86_64/dl-machine.h (elf_machine_rela): Replace
	__builtin_expect with __glibc_likely and __glibc_likely.
	(elf_machine_lazy_rel): Likewise.