runtime: use new frame argument size information
With this CL, I believe the runtime always knows
the frame size during the gc walk. There is no fallback
to "assume entire stack frame of caller" anymore.
R=golang-dev, khr, cshapiro, dvyukov
CC=golang-dev
https://golang.org/cl/11374044
diff --git a/src/pkg/runtime/runtime.h b/src/pkg/runtime/runtime.h
index 3940c30..ce451b0 100644
--- a/src/pkg/runtime/runtime.h
+++ b/src/pkg/runtime/runtime.h
@@ -690,6 +690,7 @@
void runtime·traceback(uintptr pc, uintptr sp, uintptr lr, G* gp);
void runtime·tracebackothers(G*);
bool runtime·haszeroargs(uintptr pc);
+bool runtime·topofstack(Func*);
/*
* external data
