BokehDOFRecombine Incurs Cost Even While DOF Is Not Enabled

While separate translucency is enabled DOFRecombine will incur a cost even when not using DOF (Scale of 0 or blur size of 0). Maybe we can check to see if those values are == 0 (meaning DOF is effectively disabled) and not incur the cost.

There will also be a BokehDOFRecombine cost even when using other DOF methods such as Gaussian. Although in my tests the cost was very trivial (0.04 ms) the licensee is getting a cost of .34 ms.

1. Open a blank project
2. Add an unbound postprocess volume and under DOF settings set scale to 0
3. Enter ProfileGPU in console

RESULT
There will be a cost for BokehDOFRecombine.

EXPECTED
There is no cost while the DOF Scale is 0 or the Blur Size is 0.