Use movw/movt instead of constant pool on ARMv7

src/x64/assembler-x64-inl.h

Index: src/x64/assembler-x64-inl.h
diff --git a/src/x64/assembler-x64-inl.h b/src/x64/assembler-x64-inl.h
index f3940e8255e21349c7b90cbddcf1b23b3aa1d649..d022340c10a636ac66b2816690c4d24dc718512e 100644
--- a/src/x64/assembler-x64-inl.h
+++ b/src/x64/assembler-x64-inl.h
@@ -195,6 +195,12 @@ void Assembler::set_target_address_at(Address pc, Address target) {
   CPU::FlushICache(pc, sizeof(int32_t));
 }
 
+
+Address Assembler::target_address_from_return_address(Address pc) {
+  return pc - kCallTargetAddressOffset;
+}
+
+
 Handle<Object> Assembler::code_target_object_handle_at(Address pc) {
   return code_targets_[Memory::int32_at(pc)];
 }