Skip samples where top function's stack frame is not setup properly

src/profile-generator-inl.h

Index: src/profile-generator-inl.h
diff --git a/src/profile-generator-inl.h b/src/profile-generator-inl.h
index 64dabf62b7a1e018d0e1b940ca357a10bf86a504..8543f2784d7ebe34dd8603256509f35f7c5b0382 100644
--- a/src/profile-generator-inl.h
+++ b/src/profile-generator-inl.h
@@ -55,7 +55,9 @@ CodeEntry::CodeEntry(Logger::LogEventsAndTags tag,
       resource_name_(resource_name),
       line_number_(line_number),
       shared_id_(0),
-      security_token_id_(security_token_id) {
+      security_token_id_(security_token_id),
+      frame_setup_offset_(-1),
+      frame_destroy_offset_(-1) {
 }