DFG should compile a little sooner
https://bugs.webkit.org/show_bug.cgi?id=113835

Unreviewed.

Rolled out r147511 because it was based on incorrect performance
measurement.

* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::optimizationThresholdScalingFactor):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147514 268f45cc-cd09-0410-ab3c-d52691b4dbfc