Simplify constant pool usage in x64 code generator (by removing extra argument

runtime/vm/code_patcher_x64_test.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
@@ skipping 21 matching lines @@
 
   const String& target_name = String::Handle(String::New("targetFunction"));
   const Array& args_descriptor =
       Array::Handle(ArgumentsDescriptor::New(1, Object::null_array()));
   const ICData& ic_data = ICData::ZoneHandle(ICData::New(function,
                                                          target_name,
                                                          args_descriptor,
                                                          15,
                                                          1));
 
-  __ LoadObject(RBX, ic_data, PP);
+  // Code accessing pp is generated, but not executed. Uninitialized pp is OK.
+  __ set_constant_pool_allowed(true);
+
+  __ LoadObject(RBX, ic_data);
   ExternalLabel target_label(StubCode::OneArgCheckInlineCacheEntryPoint());
   __ CallPatchable(&target_label);
   __ ret();
 }
 
 
 ASSEMBLER_TEST_RUN(IcDataAccess, test) {
   uword return_address = test->entry() + CodePatcher::InstanceCallSizeInBytes();
   ICData& ic_data = ICData::Handle();
   CodePatcher::GetInstanceCallAt(return_address, test->code(), &ic_data);
   EXPECT_STREQ("targetFunction",
       String::Handle(ic_data.target_name()).ToCString());
   EXPECT_EQ(1, ic_data.NumArgsTested());
   EXPECT_EQ(0, ic_data.NumberOfChecks());
 }
 
 }  // namespace dart
 
 #endif  // TARGET_ARCH_X64