Remove support for Javascript warnings in the VM.

runtime/vm/intermediate_language.cc

 // Copyright (c) 2013, 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/intermediate_language.h"
 
 #include "vm/bit_vector.h"
 #include "vm/bootstrap.h"
 #include "vm/compiler.h"
 #include "vm/constant_propagator.h"
@@ skipping 25 matching lines @@
 DEFINE_FLAG(bool, propagate_ic_data, true,
     "Propagate IC data from unoptimized to optimized IC calls.");
 DEFINE_FLAG(bool, two_args_smi_icd, true,
     "Generate special IC stubs for two args Smi operations");
 DEFINE_FLAG(bool, unbox_numeric_fields, true,
     "Support unboxed double and float32x4 fields.");
 DEFINE_FLAG(bool, fields_may_be_reset, false,
             "Don't optimize away static field initialization");
 DECLARE_FLAG(bool, eliminate_type_checks);
 DECLARE_FLAG(bool, trace_optimization);
-DECLARE_FLAG(bool, throw_on_javascript_int_overflow);
 
 Definition::Definition(intptr_t deopt_id)
     : Instruction(deopt_id),
       range_(NULL),
       type_(NULL),
       temp_index_(-1),
       ssa_temp_index_(-1),
       input_use_list_(NULL),
       env_use_list_(NULL),
       constant_value_(NULL) {
@@ skipping 1259 matching lines @@
       UNREACHABLE();
     }
 
     default:
       return can_overflow();
   }
 }
 
 
 bool BinarySmiOpInstr::CanDeoptimize() const {
-  if (FLAG_throw_on_javascript_int_overflow && (Smi::kBits > 32)) {
-    // If Smi's are bigger than 32-bits, then the instruction could deoptimize
-    // if the result is too big.
-    return true;
-  }
   switch (op_kind()) {
     case Token::kBIT_AND:
     case Token::kBIT_OR:
     case Token::kBIT_XOR:
       return false;
 
     case Token::kSHR:
       return !RangeUtils::IsPositive(right()->definition()->range());
 
     case Token::kSHL:
@@ skipping 2390 matching lines @@
   set_native_c_function(native_function);
   function().SetIsNativeAutoSetupScope(auto_setup_scope);
   Dart_NativeEntryResolver resolver = library.native_entry_resolver();
   bool is_bootstrap_native = Bootstrap::IsBootstapResolver(resolver);
   set_is_bootstrap_native(is_bootstrap_native);
 }
 
 #undef __
 
 }  // namespace dart