Cycles: Fixed compilation of CUDA kernels. Follow-up fix for my last commit.

intern/cycles/kernel/kernels/cuda/kernel_config.h

@@ -73,13 +73,14 @@
 
 /* tunable parameters */
 #  define CUDA_THREADS_BLOCK_WIDTH 16
-#  define CUDA_KERNEL_MAX_REGISTERS 48
-#  define CUDA_KERNEL_BRANCHED_MAX_REGISTERS 63
-
 /* CUDA 9.0 seems to cause slowdowns on high-end Pascal cards unless we increase the number of registers */
 #  if __CUDACC_VER_MAJOR__ == 9 && __CUDA_ARCH__ >= 600
-#    #define CUDA_KERNEL_MAX_REGISTERS 64
+#    define CUDA_KERNEL_MAX_REGISTERS 64
+#  else
+#    define CUDA_KERNEL_MAX_REGISTERS 48
 #  endif
+#  define CUDA_KERNEL_BRANCHED_MAX_REGISTERS 63
+
 
 /* unknown architecture */
 #else