Special case the recording of constant pool entries in the slot buffer.

src/a64/assembler-a64-inl.h

Index: src/a64/assembler-a64-inl.h
diff --git a/src/a64/assembler-a64-inl.h b/src/a64/assembler-a64-inl.h
index e68dee073822f0c56e03b05c19ec44a35f305951..b82464c0c52f9ca3a5b94aa97d21b3d7c62b60d3 100644
--- a/src/a64/assembler-a64-inl.h
+++ b/src/a64/assembler-a64-inl.h
@@ -649,6 +649,12 @@ Address RelocInfo::target_address_address() {
 }
 
 
+Address RelocInfo::constant_pool_entry_address() {
+  ASSERT(IsInConstantPool());
+  return Assembler::target_pointer_address_at(pc_);
+}
+
+
 Object* RelocInfo::target_object() {
   ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
   return reinterpret_cast<Object*>(Assembler::target_address_at(pc_));