Implement experimental exponentiation operator

src/full-codegen.cc

Index: src/full-codegen.cc
diff --git a/src/full-codegen.cc b/src/full-codegen.cc
index 6f43497a799ed73d0d6b1c6845d6bfcb400fb36f..c6eb2cc6fa33022bf085cc96f3d6f0151bd2c1b3 100644
--- a/src/full-codegen.cc
+++ b/src/full-codegen.cc
@@ -496,7 +496,7 @@ void FullCodeGenerator::RecordBackEdge(BailoutId ast_id) {
 bool FullCodeGenerator::ShouldInlineSmiCase(Token::Value op) {
   // Inline smi case inside loops, but not division and modulo which
   // are too complicated and take up too much space.
-  if (op == Token::DIV ||op == Token::MOD) return false;
+  if (op == Token::DIV ||op == Token::MOD || op == Token::EXP) return false;
   if (FLAG_always_inline_smi_code) return true;
   return loop_depth_ > 0;
 }