[arm] Share constant pool entries in snapshot.

src/code-stubs.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/code-stubs.h"
 
 #include <sstream>
 
 #include "src/arguments.h"
 #include "src/assembler-inl.h"
@@ skipping 146 matching lines @@
   Heap* heap = isolate()->heap();
   Code* code;
   if (UseSpecialCache() ? FindCodeInSpecialCache(&code)
                         : FindCodeInCache(&code)) {
     DCHECK(GetCodeKind() == code->kind());
     return Handle<Code>(code);
   }
 
   {
     HandleScope scope(isolate());
+    // Canonicalize handles, so that we can share constant pool entries pointing
+    // to code targets without dereferencing their handles.
+    CanonicalHandleScope canonical(isolate());
 
     Handle<Code> new_object = GenerateCode();
     new_object->set_stub_key(GetKey());
     FinishCode(new_object);
     RecordCodeGeneration(new_object);
 
 #ifdef ENABLE_DISASSEMBLER
     if (FLAG_print_code_stubs) {
       CodeTracer::Scope trace_scope(isolate()->GetCodeTracer());
       OFStream os(trace_scope.file());
@@ skipping 981 matching lines @@
 }
 
 ArrayConstructorStub::ArrayConstructorStub(Isolate* isolate)
     : PlatformCodeStub(isolate) {}
 
 InternalArrayConstructorStub::InternalArrayConstructorStub(Isolate* isolate)
     : PlatformCodeStub(isolate) {}
 
 }  // namespace internal
 }  // namespace v8