Add some missing cfi frame info in rc4-md5-x86_64.pl

Reviewed-by: NKurt Roeckx <kurt@roeckx.be>
(Merged from https://github.com/openssl/openssl/pull/10679)

crypto/rc4/asm/rc4-md5-x86_64.pl

@@ -486,6 +486,7 @@ $code.=<<___;
 .type	RC4_set_key,\@function,3
 .align	16
 RC4_set_key:
+.cfi_startproc
 	lea	8($dat),$dat
 	lea	($inp,$len),$inp
 	neg	$len
@@ -521,6 +522,7 @@ RC4_set_key:
 	mov	%eax,-8($dat)
 	mov	%eax,-4($dat)
 	ret
+.cfi_endproc
 .size	RC4_set_key,.-RC4_set_key
 
 .globl	RC4_options

crypto/rc4/asm/rc4-x86_64.pl

@@ -455,6 +455,7 @@ $code.=<<___;
 .type	RC4_set_key,\@function,3
 .align	16
 RC4_set_key:
+.cfi_startproc
 	lea	8($dat),$dat
 	lea	($inp,$len),$inp
 	neg	$len
@@ -521,6 +522,7 @@ RC4_set_key:
 	mov	%eax,-8($dat)
 	mov	%eax,-4($dat)
 	ret
+.cfi_endproc
 .size	RC4_set_key,.-RC4_set_key
 
 .globl	RC4_options