perf auxtrace: Uninline functions that touch perf_session

So that we don't carry the session.h include directive in auxtrace.h,
which in turn opens a can of worms of files that were getting all sorts
of things via that include, fix them all.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-d2d83aovpgri2z75wlitquni@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/code-reading.c

@@ -13,7 +13,9 @@
 
 #include "debug.h"
 #include "dso.h"
+#include "env.h"
 #include "parse-events.h"
+#include "trace-event.h"
 #include "evlist.h"
 #include "evsel.h"
 #include "thread_map.h"
@@ -496,6 +498,10 @@ static void fs_something(void)
 	}
 }
 
+#ifdef __s390x__
+#include "header.h" // for get_cpuid()
+#endif
+
 static const char *do_determine_event(bool excl_kernel)
 {
 	const char *event = excl_kernel ? "cycles:u" : "cycles";