Merge comments. See below.

- Added ptag ignore annotation threshold
- prefixed everythig with grpc_
- removed spurious annotations in channel_create.c and client_channel.c
- removed stap_probes.h (it's generated from stap_probes.d by make)
- Updated Makefile and its template with the right way to generate stap
  probe headers from its .d definition.
diff --git a/templates/Makefile.template b/templates/Makefile.template
index fa1ff2b..4c63fb2 100644
--- a/templates/Makefile.template
+++ b/templates/Makefile.template
@@ -898,7 +898,8 @@
 
 % endfor
 
-ifeq ($(CONFIG), stapprof)
+ifeq ($(CONFIG),stapprof)
+src/core/profiling/stap_timers.c: $(GENDIR)/src/core/profiling/stap_probes.h
 ifeq ($(HAS_SYSTEMTAP),true)
 $(GENDIR)/src/core/profiling/stap_probes.h: src/core/profiling/stap_probes.d
 	$(E) "[DTRACE]  Compiling $<"