Fixes for API changes done in Blender 2.80

Seems to work with both Blender 2.79 and 2,80.

benchmark/configure.py

@@ -2,6 +2,24 @@
 
 import bpy
 
+def getUserPreferences(context):
+    preferences = getattr(context, 'user_preferences', None)
+    if preferences is None:
+        preferences = context.preferences
+    return preferences
+
+
+def getAllAvailableDevices():
+    import _cycles
+    all_devices = []
+    blender_version = bpy.app.version
+    if bpy.app.version < (2, 80, 0):
+        return _cycles.available_devices()
+    all_devices.extend(_cycles.available_devices('CPU'))
+    all_devices.extend(_cycles.available_devices('CUDA'))
+    all_devices.extend(_cycles.available_devices('OPENCL'))
+    return all_devices
+
 def setDeviceCPU(context, cpref):
     cpref.compute_device_type = 'NONE'
     return True
@@ -148,13 +166,13 @@ def logComputeDevices(cpref):
 def logSystemInfo(cpref):
     import json
     info_devices = []
-    for device in cpref.devices:
+    for device in getAllAvailableDevices():
         info_device = {
-            "name": device.name.replace(" (Display)", ""),
+            "name": device[0].replace(" (Display)", ""),
-            "type": device.type,
+            "type": device[1],
         }
-        if device.type != 'CPU':
+        if device[1] != 'CPU':
-            info_device["is_display"] = '(Display)' in device.name
+            info_device["is_display"] = '(Display)' in device[0]
         info_devices.append(info_device)
     print("Benchmark Devices: {}" . format(json.dumps(info_devices, sort_keys=True)))
 
@@ -195,7 +213,7 @@ def main():
     args = parser.parse_args(argv)
 
     context = bpy.context
-    cpref = context.user_preferences.addons['cycles'].preferences
+    cpref = getUserPreferences(context).addons['cycles'].preferences
 
     # Adjust samples so we render real quick.
     if args.benchmark_warmup: