Add ToBoolean-conversion of constants in Crankshaft and use it when generating a branch based on ...

src/x64/lithium-x64.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1096 matching lines @@
           new LInstanceOfAndBranch(UseFixed(instance_of->left(), rax),
                                    UseFixed(instance_of->right(), rdx));
       return MarkAsCall(result, instr);
     } else if (v->IsTypeofIs()) {
       HTypeofIs* typeof_is = HTypeofIs::cast(v);
       return new LTypeofIsAndBranch(UseTempRegister(typeof_is->value()));
     } else if (v->IsIsConstructCall()) {
       return new LIsConstructCallAndBranch(TempRegister());
     } else {
       if (v->IsConstant()) {
-        if (HConstant::cast(v)->handle()->IsTrue()) {
+        if (HConstant::cast(v)->ToBoolean()) {
           return new LGoto(instr->FirstSuccessor()->block_id());
-        } else if (HConstant::cast(v)->handle()->IsFalse()) {
+        } else {
           return new LGoto(instr->SecondSuccessor()->block_id());
         }
       }
       Abort("Undefined compare before branch");
       return NULL;
     }
   }
   return new LBranch(UseRegisterAtStart(v));
 }
 
@@ skipping 976 matching lines @@
 
 LInstruction* LChunkBuilder::DoLeaveInlined(HLeaveInlined* instr) {
   HEnvironment* outer = current_block_->last_environment()->outer();
   current_block_->UpdateEnvironment(outer);
   return NULL;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64