[arm] Share constant pool entries in snapshot.

src/arm/assembler-arm.h

Index: src/arm/assembler-arm.h
diff --git a/src/arm/assembler-arm.h b/src/arm/assembler-arm.h
index 9f5d007ba6c7468b525dfbb88320b262ff0f5709..c73e1b8ab93b3424e4966849eeae4b596a8d479a 100644
--- a/src/arm/assembler-arm.h
+++ b/src/arm/assembler-arm.h
@@ -1722,6 +1722,9 @@ class Assembler : public AssemblerBase {
   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;
@@ -1780,10 +1783,9 @@ class Assembler : public AssemblerBase {
 
   // 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;