Implement experimental exponentiation operator

src/compiler/verifier.cc

 // Copyright 2014 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/compiler/verifier.h"
 
 #include <algorithm>
 #include <deque>
 #include <queue>
 #include <sstream>
@@ skipping 443 matching lines @@
       CheckUpperIs(node, Type::Integral32());
       break;
     case IrOpcode::kJSAdd:
       // Type is Number or String.
       CheckUpperIs(node, Type::NumberOrString());
       break;
     case IrOpcode::kJSSubtract:
     case IrOpcode::kJSMultiply:
     case IrOpcode::kJSDivide:
     case IrOpcode::kJSModulus:
+    case IrOpcode::kJSExponentiate:
       // Type is Number.
       CheckUpperIs(node, Type::Number());
       break;
 
     case IrOpcode::kJSToBoolean:
       // Type is Boolean.
       CheckUpperIs(node, Type::Boolean());
       break;
     case IrOpcode::kJSToNumber:
       // Type is Number.
@@ skipping 575 matching lines @@
     // Check inputs for all nodes in the block.
     for (size_t i = 0; i < block->NodeCount(); i++) {
       Node* node = block->NodeAt(i);
       CheckInputsDominate(schedule, block, node, static_cast<int>(i) - 1);
     }
   }
 }
 }
 }
 }  // namespace v8::internal::compiler