url: improve parsing speed

[bnoordhuis]

The url.parse() function now checks whether an escapable character is
in the URL before trying to escape it.

PR-URL: nodejs/node-v0.x-archive#8638

@CGavrila Would you be willing to sign the commit with your real name?

[indutny]

Please tag it, @caineio

[bnoordhuis]

@chrisdickinson Maybe you can review b7fc957? That one can go in without having to wait for the OPR (original pull requester; yes, I made that up on the spot.)

[chrisdickinson]

@bnoordhuis done and done. Had one request + a italicized verdant hope for a v8 feature, otherwise b7fc957 looks good.

[bnoordhuis]

Cheers Chris, incorporated the feedback and landed in 21a679a.

I wish there was a way we could tell v8 to make sure not to OSR-inline the url.parse since that could skew the results.

I suppose doing a few url.parse() trial runs, then calling %OptimizeFunctionOnNextCall(url.parse) before the actual benchmark might do it. I'll see if I can make it work.

[bnoordhuis]

Closing, this landed by way of the joyent/v0.12 merge in 94e1475.