trace: [tcg] Define TCG tracing helper routine wrappers

Generates header "trace/generated-helpers-wrappers.h" with definitions for TCG
helper wrappers.

These wrappers ('gen_helper_trace_${event}_exec_wrapper') transform mixed native
and TCG argument types to TCG types and call the actual TCG helpers
('gen_helper_trace_${event}_exec_proxy').

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/Makefile b/Makefile
index 09601f7..fa93fc9 100644
--- a/Makefile
+++ b/Makefile
@@ -57,6 +57,7 @@
 endif
 GENERATED_SOURCES += trace/generated-tracers.c
 
+GENERATED_HEADERS += trace/generated-helpers-wrappers.h
 GENERATED_HEADERS += trace/generated-helpers.h
 GENERATED_SOURCES += trace/generated-helpers.c