V4 JIT: Hoist QVector allocation out of a loop.
V4 JIT: Hoist QVector allocation out of a loop.

Use erase() each loop iteration, but preserve the underlying allocation.

Change-Id: I673766f5567794215465daa597a4839a4900450b
Reviewed-by: Simon Hausmann <a975102812d593b3191088e3d0aeaeb6f11dbcf5@digia.com>

matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative