Cycles: inline more functions on the GPU

This makes little difference for CUDA and OpenCL, but will be helpful
for Optix.

intern/cycles/kernel/kernel_path_volume.h

@@ -57,18 +57,12 @@ ccl_device_inline void kernel_path_volume_connect_light(KernelGlobals *kg,
 #  endif /* __EMISSION__ */
 }
 
-#  ifdef __KERNEL_GPU__
-ccl_device_noinline
-#  else
-ccl_device
-#  endif
-    bool
-    kernel_path_volume_bounce(KernelGlobals *kg,
-                              ShaderData *sd,
-                              ccl_addr_space float3 *throughput,
-                              ccl_addr_space PathState *state,
-                              PathRadianceState *L_state,
-                              ccl_addr_space Ray *ray)
+ccl_device_noinline_cpu bool kernel_path_volume_bounce(KernelGlobals *kg,
+                                                       ShaderData *sd,
+                                                       ccl_addr_space float3 *throughput,
+                                                       ccl_addr_space PathState *state,
+                                                       PathRadianceState *L_state,
+                                                       ccl_addr_space Ray *ray)
 {
   /* sample phase function */
   float phase_pdf;