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util: check RegExp is function

Rodrigo Muino Tomonari requested to merge github/fork/yosuke-furukawa/fix/check_RegExp_isFunction into v1.x

I am checking benchmark tests. When I execute the following tests, I got the errors.

$ ./iojs benchmark/common.js misc/
misc//v8-bench.js
util.js:84
    if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
        ^
TypeError: object is not a function
    at Object.exports.debuglog (util.js:84:32)
    at timers.js:12:29
    at NativeModule.compile (node.js:800:5)
    at NativeModule.require (node.js:769:18)
    at net.js:5:14
    at NativeModule.compile (node.js:800:5)
    at NativeModule.require (node.js:769:18)
    at tty.js:4:11
    at NativeModule.compile (node.js:800:5)
    at Function.NativeModule.require (node.js:769:18)

I don't understand why this error is occurred, but I guess RegExp is not function in vm context. So I just checked RegExp is function, the benchmark test works fine.

misc//v8-bench.js
misc/v8_bench.js Richards: 24581
misc/v8_bench.js DeltaBlue: 37548
misc/v8_bench.js Crypto: 20758
misc/v8_bench.js RayTrace: 52835
misc/v8_bench.js EarleyBoyer: 31814
misc/v8_bench.js RegExp: 4523
misc/v8_bench.js Splay: 12264
misc/v8_bench.js NavierStokes: 23945
misc/v8_bench.js Score (version 7): 21326

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