[arm] Share constant pool entries in snapshot.

src/arm/assembler-arm.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 1704 matching lines @@
   // containers for constants and code target addresses until they are emitted
   // to the constant pool. These records are temporarily stored in a separate
   // buffer until a constant pool is emitted.
   // If every instruction in a long sequence is accessing the pool, we need one
   // pending relocation entry per instruction.
 
   // The buffers of pending constant pool entries.
   std::vector<ConstantPoolEntry> pending_32_bit_constants_;
   std::vector<ConstantPoolEntry> pending_64_bit_constants_;
 
+  // Map of address of handle to index in pending_32_bit_constants_.
+  std::map<Address, int> handle_to_index_map_;
+
  private:
   // Avoid overflows for displacements etc.
   static const int kMaximalBufferSize = 512 * MB;
 
   int next_buffer_check_;  // pc offset of next buffer check
 
   // Constant pool generation
   // Pools are emitted in the instruction stream, preferably after unconditional
   // jumps or after returns from functions (in dead code locations).
   // If a long code sequence does not contain unconditional jumps, it is
@@ skipping 38 matching lines @@
   void addrmod4(Instr instr, Register rn, RegList rl);
   void addrmod5(Instr instr, CRegister crd, const MemOperand& x);
 
   // Labels
   void print(Label* L);
   void bind_to(Label* L, int pos);
   void next(Label* L);
 
   // Record reloc info for current pc_
   void RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data = 0);
-  ConstantPoolEntry::Access ConstantPoolAddEntry(int position,
-                                                 RelocInfo::Mode rmode,
-                                                 intptr_t value);
-  ConstantPoolEntry::Access ConstantPoolAddEntry(int position, double value);
+  void ConstantPoolAddEntry(int position, RelocInfo::Mode rmode,
+                            intptr_t value);
+  void ConstantPoolAddEntry(int position, double value);
 
   friend class RelocInfo;
   friend class CodePatcher;
   friend class BlockConstPoolScope;
   friend class EnsureSpace;
 };
 
 constexpr int kNoCodeAgeSequenceLength = 3 * Assembler::kInstrSize;
 
 class EnsureSpace BASE_EMBEDDED {
  public:
   INLINE(explicit EnsureSpace(Assembler* assembler));
 };
 
 class PatchingAssembler : public Assembler {
  public:
   PatchingAssembler(IsolateData isolate_data, byte* address, int instructions);
   ~PatchingAssembler();
 
   void Emit(Address addr);
   void FlushICache(Isolate* isolate);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARM_ASSEMBLER_ARM_H_