perf probe: Query basic types from debuginfo

Query the basic type information (byte-size and signed-flag) from
debuginfo and pass that to kprobe-tracer. This is especially useful
for tracing the members of data structure, because each member has
different byte-size on the memory.

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20100412171715.3790.23730.stgit@localhost6.localdomain6>
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/probe-event.h

@@ -23,6 +23,7 @@ struct kprobe_trace_arg_ref {
 struct kprobe_trace_arg {
 	char				*name;	/* Argument name */
 	char				*value;	/* Base value */
+	char				*type;	/* Type name */
 	struct kprobe_trace_arg_ref	*ref;	/* Referencing offset */
 };