VM: Store edge counters in one per-function array.

runtime/vm/isolate.h

Index: runtime/vm/isolate.h
diff --git a/runtime/vm/isolate.h b/runtime/vm/isolate.h
index eb929bf3a41b2c6cda386c31b63a0230c76062a5..265960c71bad4c62fa9c8c07d4ca5aaed7a2a0e2 100644
--- a/runtime/vm/isolate.h
+++ b/runtime/vm/isolate.h
@@ -605,15 +605,6 @@ class Isolate : public BaseIsolate {
     deopt_context_ = value;
   }
 
-  int32_t edge_counter_increment_size() const {
-    return edge_counter_increment_size_;
-  }
-  void set_edge_counter_increment_size(int32_t size) {
-    ASSERT(edge_counter_increment_size_ == -1);
-    ASSERT(size >= 0);
-    edge_counter_increment_size_ = size;
-  }
-
   void UpdateLastAllocationProfileAccumulatorResetTimestamp() {
     last_allocationprofile_accumulator_reset_timestamp_ =
         OS::GetCurrentTimeMillis();
@@ -884,7 +875,6 @@ class Isolate : public BaseIsolate {
   Dart_GcEpilogueCallback gc_epilogue_callback_;
   intptr_t defer_finalization_count_;
   DeoptContext* deopt_context_;
-  int32_t edge_counter_increment_size_;
 
   CompilerStats* compiler_stats_;