Reapply "Move megamorphic cache table into the Dart heap."

runtime/vm/flow_graph_compiler_arm64.cc

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 1239 matching lines @@
   __ Drop(argument_count);
 }
 
 
 void FlowGraphCompiler::EmitMegamorphicInstanceCall(
     const ICData& ic_data,
     intptr_t argument_count,
     intptr_t deopt_id,
     intptr_t token_pos,
     LocationSummary* locs) {
-  MegamorphicCacheTable* table = Isolate::Current()->megamorphic_cache_table();
   const String& name = String::Handle(zone(), ic_data.target_name());
   const Array& arguments_descriptor =
       Array::ZoneHandle(zone(), ic_data.arguments_descriptor());
   ASSERT(!arguments_descriptor.IsNull() && (arguments_descriptor.Length() > 0));
-  const MegamorphicCache& cache = MegamorphicCache::ZoneHandle(
-      zone(), table->Lookup(name, arguments_descriptor));
+  const MegamorphicCache& cache = MegamorphicCache::ZoneHandle(zone(),
+      MegamorphicCacheTable::Lookup(isolate(), name, arguments_descriptor));
   const Register receiverR = R0;
   const Register cacheR = R1;
   const Register targetR = R1;
   __ LoadFromOffset(receiverR, SP, (argument_count - 1) * kWordSize);
   __ LoadObject(cacheR, cache);
 
   if (FLAG_use_megamorphic_stub) {
     __ BranchLink(*StubCode::MegamorphicLookup_entry());
   } else  {
     StubCode::EmitMegamorphicLookup(assembler(), receiverR, cacheR, targetR);
@@ skipping 556 matching lines @@
 void ParallelMoveResolver::RestoreFpuScratch(FpuRegister reg) {
   __ PopDouble(reg);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64