perf annotate: Fix AArch64 comment char

The commit 0fcb1da4aba "perf annotate: AArch64 support" blindly copied
the comment character from the original:

https://lkml.org/lkml/2016/5/19/461

whereas that same commit shows objdump output utilizing the C++ style
"//" as the comment delimeter. Since '/' doesn't occur elsewhere in
objdump output, we retain the single character check, but fix it to be
'/'.

Signed-off-by: Kim Phillips <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Chris Riyder <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Fixes: 0fcb1da4aba6 ("perf annotate: AArch64 support")
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/arch/arm64/annotate/instructions.c

···
 	arch->initialized = true;
 	arch->priv	  = arm;
 	arch->associate_instruction_ops   = arm64__associate_instruction_ops;
-	arch->objdump.comment_char	  = ';';
+	arch->objdump.comment_char	  = '/';
 	arch->objdump.skip_functions_char = '+';
 	return 0;