- Consolidate verbose-gc output to be a single line which can be imported easily into spreadsheets.

runtime/vm/scavenger.h

Index: runtime/vm/scavenger.h
===================================================================
--- runtime/vm/scavenger.h	(revision 16586)
+++ runtime/vm/scavenger.h	(working copy)
@@ -62,8 +62,8 @@
   }
 
   // Collect the garbage in this scavenger.
-  void Scavenge(const char* gc_reason);
-  void Scavenge(bool invoke_api_callbacks, const char* gc_reason);
+  void Scavenge();
+  void Scavenge(bool invoke_api_callbacks);
 
   // Accessors to generate code for inlined allocation.
   uword* TopAddress() { return &top_; }
@@ -159,8 +159,6 @@
   // All object are aligned to this value.
   uword object_alignment_;
 
-  // Scavenge cycle count.
-  int count_;
   // Keep track whether a scavenge is currently running.
   bool scavenging_;
   // Keep track whether the scavenge had a promotion failure.