Revert "arm64: alternatives: Move length validation in alternative_{insn, endif}"

hulk inclusion
category: performance
bugzilla: https://e.gitee.com/open_euler/issues/list?issue=I4SCW7
CVE: NA

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This reverts commit c50395ff.

Temporary rollback, which will be backported later so that other patches
can be backported without conflict.
Signed-off-by: NZhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: NWeilong Chen <chenweilong@huawei.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/arm64/include/asm/alternative.h

@@ -119,9 +119,9 @@ static inline void apply_alternatives_module(void *start, size_t length) { }
 	.popsection
 	.subsection 1
 663:	\insn2
-664:	.org	. - (664b-663b) + (662b-661b)
+664:	.previous
+	.org	. - (664b-663b) + (662b-661b)
 	.org	. - (662b-661b) + (664b-663b)
-	.previous
 	.endif
 .endm
 
@@ -191,11 +191,11 @@ static inline void apply_alternatives_module(void *start, size_t length) { }
  */
 .macro alternative_endif
 664:
-	.org	. - (664b-663b) + (662b-661b)
-	.org	. - (662b-661b) + (664b-663b)
 	.if .Lasm_alt_mode==0
 	.previous
 	.endif
+	.org	. - (664b-663b) + (662b-661b)
+	.org	. - (662b-661b) + (664b-663b)
 .endm
 
 /*