[strong] Fix weird work-around for magic truncating int conversions.

src/hydrogen.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/hydrogen.h"
 
 #include <sstream>
 
 #include "src/v8.h"
 
@@ skipping 10990 matching lines @@
   HInstruction* instr = NULL;
   // Only the stub is allowed to call into the runtime, since otherwise we would
   // inline several instructions (including the two pushes) for every tagged
   // operation in optimized code, which is more expensive, than a stub call.
   if (graph()->info()->IsStub() && is_non_primitive) {
     HValue* function =
         AddLoadJSBuiltin(BinaryOpIC::TokenToJSBuiltin(op, strength));
     Add<HPushArguments>(left, right);
     instr = AddUncasted<HInvokeFunction>(function, 2);
   } else {
-    if (is_strong(strength) && Token::IsBitOp(op)) {
-      // TODO(conradw): This is not efficient, but is necessary to prevent
-      // conversion of oddball values to numbers in strong mode. It would be
-      // better to prevent the conversion rather than adding a runtime check.
-      IfBuilder if_builder(this);
-      if_builder.If<HHasInstanceTypeAndBranch>(left, ODDBALL_TYPE);
-      if_builder.OrIf<HHasInstanceTypeAndBranch>(right, ODDBALL_TYPE);
-      if_builder.Then();
-      Add<HCallRuntime>(
-          isolate()->factory()->empty_string(),
-          Runtime::FunctionForId(Runtime::kThrowStrongModeImplicitConversion),
-          0);
-      if (!graph()->info()->IsStub()) {
-        Add<HSimulate>(opt_id, REMOVABLE_SIMULATE);
-      }
-      if_builder.End();
-    }
     switch (op) {
       case Token::ADD:
         instr = AddUncasted<HAdd>(left, right, strength);
         break;
       case Token::SUB:
         instr = AddUncasted<HSub>(left, right, strength);
         break;
       case Token::MUL:
         instr = AddUncasted<HMul>(left, right, strength);
         break;
@@ skipping 2397 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8