This is a heads up of the following change:

In bug 1063816 we are tracking to rename useCount to the more appriopiate name 
of warmupCounter.

The purpose of this count(er) still stays the same, but the name now says 
exactly what this number does. It is a warmupCounter deciding when Baseline and 
IonMonkey can kick in. And this counter gets reset when we think there should 
be some stabilization period before IonMonkey/Baseline can kick in again.

The old name has been used for a long time and intern we have grown very 
accustome to it. Even so accustome we don't actually see it can cause confusion 
for newer people. This rename makes it easier for new people to understand what 
this does.

At the same time usesBeforeCompile and usesBeforeInlining etc will change to 
ionWarmUpThreshold and baselineWarmUpThreshold.
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