V4 JIT: enable register allocator on win32.

Change-Id: I7134bd3721df0e000ad0bd135c01e76c55271156
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
Remove isES() usage in scenegraph

The error signal patch added some usages of QOpenGLFunctions::isES().
These need to be temporarily removed.

Change-Id: Ibd1d8094059020708aefe4b3502ba56d624928b3
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>