[es6] do not add caller/arguments to ES6 function definitions

test/webkit/strict-throw-type-error-expected.txt

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-ThrowTypeError is a singleton object
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-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
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-PASS functionCaller1 === functionCaller2 is true
-PASS functionCaller1 === functionArguments1 is true
-PASS functionCaller1 === argumentsCaller1 is true
-PASS functionCaller1 === argumentsCallee1 is true
-PASS functionCaller1 === boundCaller1 is true
-PASS functionCaller1 === boundArguments1 is true
-PASS functionCaller2 === functionArguments2 is true
-PASS functionCaller2 === argumentsCaller2 is true
-PASS functionCaller2 === argumentsCallee2 is true
-PASS functionCaller2 === boundCaller2 is true
-PASS functionCaller2 === boundArguments2 is true
-PASS successfullyParsed is true
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-TEST COMPLETE
-