kern: optimize timespan -> tick codegen, improve .text layout

mesosphere/kernel/kernel.ld

@@ -51,24 +51,24 @@ SECTIONS
 		. = ALIGN(8);
 	} :code
 
-	/* .vectors. */
-	. = ALIGN(2K);
-	__vectors_start__ = . ;
-  .vectors :
-	{
-		KEEP( *(.vectors) )
-		. = ALIGN(8);
-	} :code
-
 	/* .sleep. */
 	. = ALIGN(4K);
 	__sleep_start__ = . ;
-  .sleep :
+    .sleep :
 	{
 		KEEP( *(.sleep .sleep.*) )
 		. = ALIGN(8);
 	} :code
 
+	/* .vectors. */
+	. = ALIGN(2K);
+	__vectors_start__ = . ;
+    .vectors :
+	{
+		KEEP( *(.vectors) )
+		. = ALIGN(8);
+	} :code
+
 	/* =========== RODATA section =========== */
 	. = ALIGN(0x1000);
 	__rodata_start = . ;