Add .cfi_startproc/.cfi_endproc to ENTRY/END.

Bug: 10414953
Change-Id: I711718098b9f3cc0ba8277778df64557e9c7b2a0
diff --git a/libc/arch-x86_64/bionic/sigsetjmp.S b/libc/arch-x86_64/bionic/sigsetjmp.S
index 51b055a..842d6ff 100644
--- a/libc/arch-x86_64/bionic/sigsetjmp.S
+++ b/libc/arch-x86_64/bionic/sigsetjmp.S
@@ -77,6 +77,7 @@
 
 2:	xorl	%eax,%eax
 	ret
+END(sigsetjmp)
 
 ENTRY(siglongjmp)
 	movq	%rdi,%r12
@@ -105,3 +106,4 @@
 	incl	%eax
 1:	movq	%r11,0(%rsp)
 	ret
+END(siglongjmp)