clock: Simplify subr_ticks and rename

- We can use builtin constants for the size of int and long to simplify
  definitions.
- The file should have a .S prefix since we want to run it through the
  preprocessor, though apparently this happens anyway with .s...
- Move ticks and ticksl from .data to .bss.

Reported by:	jrtc27
Reviewed by:	jrtc27, kib, emaste
Fixes:		6b82130e6c ("clock: Add a long ticks variable, ticksl")
Differential Revision:	https://reviews.freebsd.org/D48420

sys/conf/files

@@ -3932,7 +3932,7 @@ kern/subr_stack.c		optional ddb | stack | ktr
 kern/subr_stats.c		optional stats
 kern/subr_taskqueue.c		standard
 kern/subr_terminal.c		optional vt
-kern/subr_ticks.s		standard
+kern/subr_ticks.S		standard
 kern/subr_trap.c		standard
 kern/subr_turnstile.c		standard
 kern/subr_uio.c			standard

sys/kern/subr_ticks.S

@@ -16,29 +16,21 @@
 GNU_PROPERTY_AARCH64_FEATURE_1_NOTE(GNU_PROPERTY_AARCH64_FEATURE_1_VAL)
 #endif
 
-#ifdef _ILP32
-#define	SIZEOF_TICKSL	4
-#define	TICKSL_INIT	.long 0
-#else
-#define	SIZEOF_TICKSL	8
-#define	TICKSL_INIT	.quad 0
-#endif
-
-#if defined(_ILP32) || __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
 #define	TICKS_OFFSET	0
 #else
-#define	TICKS_OFFSET	4
+#define	TICKS_OFFSET	(__SIZEOF_LONG__ - __SIZEOF_INT__)
 #endif
 
-	.data
+	.bss
 
 	.global ticksl
 	.type ticksl, %object
-	.align SIZEOF_TICKSL
-ticksl:	TICKSL_INIT
-	.size ticksl, SIZEOF_TICKSL
+	.align __SIZEOF_LONG__
+ticksl:	.zero __SIZEOF_LONG__
+	.size ticksl, __SIZEOF_LONG__
 
 	.global ticks
 	.type ticks, %object
 ticks	=ticksl + TICKS_OFFSET
-	.size ticks, 4
+	.size ticks, __SIZEOF_INT__