Add TraceBuffer log to all Functions (plus small tweaks to function-view)

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index 681d05b088d19ba01730b329d986a0f4e01d8cc8..7acb8d91fbf0ca51c8c0911a8411f6fd6c70d75c 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -1895,6 +1895,16 @@ class Function : public Object {
     return RoundedAllocationSize(sizeof(RawFunction));
   }
 
+  TraceBuffer* log() const {
+    ASSERT(raw_ptr()->log_ != NULL);
+    return raw_ptr()->log_;
+  }
+
+  void set_log(TraceBuffer* trace_buffer) const {
+    ASSERT(trace_buffer != NULL);
+    raw_ptr()->log_ = trace_buffer;
+  }
+
   static RawFunction* New(const String& name,
                           RawFunction::Kind kind,
                           bool is_static,