Cycles / CUDA: Increase maximum image textures on GPU.

Instead of 95, we can use 145 images now. This only affects Kepler and above (sm30, sm_35 and sm_50).

This can be increased further if needed, but let's first test if this does not come with a performance impact.

Originally developed during my GSoC 2013.

intern/cycles/device/device_cuda.cpp

@@ -1150,6 +1150,7 @@ void device_cuda_info(vector<DeviceInfo>& devices)
 		int major, minor;
 		cuDeviceComputeCapability(&major, &minor, num);
 		info.advanced_shading = (major >= 2);
+		info.extended_images = (major >= 3);
 		info.pack_images = false;
 
 		/* if device has a kernel timeout, assume it is used for display */