perf annotate: Add support to toggle percent type

Add new key bindings to toggle percent type/base in annotation UI browser:

 'p' to switch between local and global percent type
 'b' to switch between hits and perdio percent base

Add the following help messages to the UI browser '?' window:

  ...
  p             Toggle percent type [local/global]
  b             Toggle percent base [period/hits]
  ...

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/20180804130521.11408-17-jolsa@kernel.org
[ Moved percent_type to be the last arg to sym_title(), its an arg to what is being formmated (buf, size) ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/annotate.h

@@ -11,6 +11,7 @@
 #include <linux/list.h>
 #include <linux/rbtree.h>
 #include <pthread.h>
+#include <asm/bug.h>
 
 struct ins_ops;
 
@@ -149,6 +150,21 @@ static inline double annotation_data__percent(struct annotation_data *data,
 	return which < PERCENT_MAX ? data->percent[which] : -1;
 }
 
+static inline const char *percent_type_str(unsigned int type)
+{
+	static const char *str[PERCENT_MAX] = {
+		"local hits",
+		"global hits",
+		"local period",
+		"global period",
+	};
+
+	if (WARN_ON(type >= PERCENT_MAX))
+		return "N/A";
+
+	return str[type];
+}
+
 static inline struct disasm_line *disasm_line(struct annotation_line *al)
 {
 	return al ? container_of(al, struct disasm_line, al) : NULL;