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

runtime/vm/flow_graph_compiler.h

Index: runtime/vm/flow_graph_compiler.h
diff --git a/runtime/vm/flow_graph_compiler.h b/runtime/vm/flow_graph_compiler.h
index 783c851bb4cf63ee52c11a3f56041d9c8bf202a4..3151009d9b2853b204811f222ed7276ca05177c2 100644
--- a/runtime/vm/flow_graph_compiler.h
+++ b/runtime/vm/flow_graph_compiler.h
@@ -387,11 +387,7 @@ class FlowGraphCompiler : public ValueObject {
 
   bool NeedsEdgeCounter(TargetEntryInstr* block);
 
-  void EmitEdgeCounter();
-
-#if !defined(TARGET_ARCH_ARM64) && !defined(TARGET_ARCH_MIPS)
-  static int32_t EdgeCounterIncrementSizeInBytes();
-#endif  // !TARGET_ARCH_ARM64 && !TARGET_ARCH_MIPS
+  void EmitEdgeCounter(intptr_t edge_id);
 
   void EmitOptimizedInstanceCall(const StubEntry& stub_entry,
                                  const ICData& ic_data,
@@ -537,6 +533,10 @@ class FlowGraphCompiler : public ValueObject {
     return inlined_code_intervals_;
   }
 
+  RawArray* edge_counters_array() const {
+    return edge_counters_array_.raw();
+  }
+
   RawArray* InliningIdToFunction() const;
 
   RawArray* CallerInliningIdMap() const;
@@ -731,6 +731,8 @@ class FlowGraphCompiler : public ValueObject {
 
   ZoneGrowableArray<const ICData*>* deopt_id_to_ic_data_;
 
+  Array& edge_counters_array_;
+
   Array& inlined_code_intervals_;
   const GrowableArray<const Function*>& inline_id_to_function_;
   const GrowableArray<intptr_t>& caller_inline_id_;