Implement experimental exponentiation operator

src/compiler/js-operator.h

 // 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.
 
 #ifndef V8_COMPILER_JS_OPERATOR_H_
 #define V8_COMPILER_JS_OPERATOR_H_
 
 #include "src/runtime/runtime.h"
 #include "src/unique.h"
 
@@ skipping 200 matching lines @@
   const Operator* BitwiseXor();
   const Operator* BitwiseAnd();
   const Operator* ShiftLeft();
   const Operator* ShiftRight();
   const Operator* ShiftRightLogical();
   const Operator* Add();
   const Operator* Subtract();
   const Operator* Multiply();
   const Operator* Divide();
   const Operator* Modulus();
+  const Operator* Exponentiate();

[titzer, 2015/02/24 18:46:22]

If this is an experimental feature, it'd be good to keep its footprint in the
compiler as small as possible. Since this is implemented as a runtime call
anyway, I would suggest dropping the operators and type rules and just make the
graph builder put in a runtime call from the beginning.

 
   const Operator* UnaryNot();
   const Operator* ToBoolean();
   const Operator* ToNumber();
   const Operator* ToString();
   const Operator* ToName();
   const Operator* ToObject();
   const Operator* Yield();
 
   const Operator* Create();
@@ skipping 38 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(JSOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_OPERATOR_H_