latest source on git compiles and runs fine here
changed x15/whirlpoolx.cu line 47 to:   uint32_t throughput = pow(2,23);
23 was the highest that works on my GTX850M
was getting about 63Mh
overclocked GPU +105 memory +800

optirun nvidia-settings -c :8 -a [gpu:0]/GPUGraphicsClockOffset[2]=105 -a [gpu:0]/GPUMemoryTransferRateOffset[2]=800

[2015-03-09 17:28:29] GPU #0: GeForce GTX 850M, 69457 kH/s
[2015-03-09 17:28:29] accepted: 907/908 (99.89%), 69475 khash/s yay!!!
[2015-03-09 17:28:42] GPU #0: GeForce GTX 850M, 69404 kH/s
[2015-03-09 17:28:42] accepted: 908/909 (99.89%), 69474 khash/s yay!!!

zero rejects and card is running quite cool 64C