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

runtime/vm/pages.h

Index: runtime/vm/pages.h
===================================================================
--- runtime/vm/pages.h	(revision 16586)
+++ runtime/vm/pages.h	(working copy)
@@ -195,7 +195,7 @@
                         HeapPage::PageType type) const;
 
   // Collect the garbage in the page space using mark-sweep.
-  void MarkSweep(bool invoke_api_callbacks, const char* gc_reason);
+  void MarkSweep(bool invoke_api_callbacks);
 
   static HeapPage* PageFor(RawObject* raw_obj) {
     return reinterpret_cast<HeapPage*>(
@@ -251,9 +251,6 @@
   intptr_t capacity_;
   intptr_t in_use_;
 
-  // Old-gen GC cycle count.
-  int count_;
-
   // Keep track whether a MarkSweep is currently running.
   bool sweeping_;