Fix bug with mint unboxing on non-SSE 4.1 machines.

runtime/vm/flow_graph_compiler_ia32.cc

 // Copyright (c) 2012, 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"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "lib/error.h"
 #include "vm/ast_printer.h"
 #include "vm/il_printer.h"
 #include "vm/locations.h"
 #include "vm/object_store.h"
 #include "vm/parser.h"
 #include "vm/stub_code.h"
 #include "vm/symbols.h"
 
 namespace dart {
 
 DECLARE_FLAG(bool, print_ast);
 DECLARE_FLAG(bool, print_scopes);
 DECLARE_FLAG(bool, reject_named_argument_as_positional);
 DECLARE_FLAG(bool, trace_functions);
-DECLARE_FLAG(bool, use_sse41);
 DEFINE_FLAG(bool, trap_on_deoptimization, false, "Trap on deoptimization.");
 DEFINE_FLAG(bool, unbox_mints, true, "Optimize 64-bit integer arithmetic.");
 
 
 bool FlowGraphCompiler::SupportsUnboxedMints() {
   // Support unboxed mints when SSE 4.1 is available.
-  return FLAG_unbox_mints
-      && CPUFeatures::sse4_1_supported()
-      && FLAG_use_sse41;
+  return FLAG_unbox_mints && CPUFeatures::sse4_1_supported();
 }
 
 
 void CompilerDeoptInfoWithStub::GenerateCode(FlowGraphCompiler* compiler,
                                              intptr_t stub_ix) {
   // Calls do not need stubs, they share a deoptimization trampoline.
   ASSERT(reason() != kDeoptAtCall);
   Assembler* assem = compiler->assembler();
 #define __ assem->
   __ Comment("Deopt stub for id %"Pd"", deopt_id());
@@ skipping 1339 matching lines @@
   __ popl(ECX);
   __ popl(EAX);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32