[TYPO3-core] RFC #16951: [Performance] Speed up makeInstance() by caching getClassName() results

[Christian Kuhn]

This is an SVN patch request.

Type: Performance improvement

Branches: trunk

BT: http://bugs.typo3.org/view.php?id=16951

Problem:
Every makeInstance() call determines the final class name by checking in 
getClassName() with class_exists() for 'ux_' classes.

Solution:
Add a very simple first level cache around the getClassName() call to 
look up already determined final class names in a local array for 
consecutive calls with the same class.

Notes:
The autoloader (which eats up most time of the class_exists() call) is 
pretty expensive but has some local caching as well. So, this patch is 
not as effective as it seems at first glance and just speeds up 'a bit'. 
On a pretty native introduction package I was able to reproduce a gain 
for a full cached page between 0,5 and 1,5%, which is actually near to 
experimental standard deviation. Still, this patch can not make things 
slower.

Regards
Christian
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