Implement experimental exponentiation operator

test/cctest/compiler/test-run-jsops.cc

Index: test/cctest/compiler/test-run-jsops.cc
diff --git a/test/cctest/compiler/test-run-jsops.cc b/test/cctest/compiler/test-run-jsops.cc
index bb7c239a59bf8fc78212412042596409f5e9b033..8e83e4f270542e4cd5d33b80a20d3cb24b9e34e6 100644
--- a/test/cctest/compiler/test-run-jsops.cc
+++ b/test/cctest/compiler/test-run-jsops.cc
@@ -81,6 +81,20 @@ TEST(BinopModulus) {
 }
 
 
+TEST(BinopExponentiate) {
+  FLAG_harmony_exponentiation = true;
+  FunctionTester T("(function(a,b) { return a ** b; })");
+
+  T.CheckCall(256, 2, 8);
+  T.CheckCall(T.Val(256), T.Val("2"), T.Val(8));
+  T.CheckCall(T.Val(256), T.Val(2), T.Val("8"));
+  T.CheckCall(T.Val(1), T.Val("256"), T.Val("0"));
+  T.CheckCall(T.nan(), T.Val("3"), T.Val("B"));
+  T.CheckCall(T.Val(0.25), T.Val("2"), T.NewObject("([-2])"));
+  T.CheckCall(T.nan(), T.Val("3"), T.NewObject("({})"));
+}
+
+
 TEST(BinopShiftLeft) {
   FunctionTester T("(function(a,b) { return a << b; })");