[perf-test] Add a binding benchmark for div.setAttribute()

[perf-test] Add a binding benchmark for div.setAttribute()
https://bugs.webkit.org/show_bug.cgi?id=86815

Reviewed by Ryosuke Niwa.

We should remove Bindings/dom-attributes.html and instead add more
reasonable micro benchmarks by classifying DOM binding call paths.

This patch adds a benchmark for div.setAttribute(). This benchmark
covers 'setAttribute' in Dromaeo/dom-attr.html and other DOM methods
that return an undefined.

Test results in my Linux desktop:

RESULT Bindings: set-attribute= 793.745073252 runs/s
median= 791.589665765 runs/s, stdev= 6.00467159709 runs/s, min= 785.27607362 runs/s, max= 808.080808081 runs/s

RESULT Bindings: set-attribute= 790.858444164 runs/s
median= 787.918921436 runs/s, stdev= 7.86264953655 runs/s, min= 780.234070221 runs/s, max= 806.04534005 runs/s

RESULT Bindings: set-attribute= 787.277571417 runs/s
median= 784.31372549 runs/s, stdev= 7.45363346657 runs/s, min= 778.588807786 runs/s, max= 804.020100503 runs/s

RESULT Bindings: set-attribute= 782.401393791 runs/s
median= 779.062978802 runs/s, stdev= 6.48250081621 runs/s, min= 777.642770352 runs/s, max= 796.019900498 runs/s

RESULT Bindings: set-attribute= 791.792516608 runs/s
median= 791.556728232 runs/s, stdev= 6.49182980397 runs/s, min= 779.220779221 runs/s, max= 808.080808081 runs/s

* Bindings/set-attribute.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@117553 268f45cc-cd09-0410-ab3c-d52691b4dbfc