VM: Refactor allocation stats code and remove duplicate code.

runtime/vm/assembler_arm.h

Index: runtime/vm/assembler_arm.h
diff --git a/runtime/vm/assembler_arm.h b/runtime/vm/assembler_arm.h
index 4301677a105b0247a0b034c71a678c8348acc1a0..70dd9ad5f0b2b0c7f99fb16f1e87868e64970711 100644
--- a/runtime/vm/assembler_arm.h
+++ b/runtime/vm/assembler_arm.h
@@ -910,13 +910,13 @@ class Assembler : public ValueObject {
   // allocation stats. These are separate assembler macros so we can
   // avoid a dependent load too nearby the load of the table address.
   void LoadAllocationStatsAddress(Register dest,
-                                  intptr_t cid);
+                                  intptr_t cid,
+                                  bool inline_isolate = true);
   void IncrementAllocationStats(Register stats_addr,
                                 intptr_t cid,
                                 Heap::Space space);
   void IncrementAllocationStatsWithSize(Register stats_addr_reg,
                                         Register size_reg,
-                                        intptr_t cid,
                                         Heap::Space space);
 
   Address ElementAddressForIntIndex(bool is_load,