Implement experimental exponentiation operator

src/compiler/js-operator.h

Index: src/compiler/js-operator.h
diff --git a/src/compiler/js-operator.h b/src/compiler/js-operator.h
index e7fc04c1e19cab287e1d92922b011ccfc85829a2..5f72919eb1924bbc7768e444ee349704eec6178c 100644
--- a/src/compiler/js-operator.h
+++ b/src/compiler/js-operator.h
@@ -218,6 +218,7 @@ class JSOperatorBuilder FINAL : public ZoneObject {
   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();