Add support of GpuGer in GpuAlloc.do_constant_folding.

theano/sandbox/gpuarray/basic_ops.py

@@ -672,7 +672,7 @@ class GpuAlloc(HideC, Alloc):
                       #theano.sandbox.gpuarray.subtensor.GpuAdvancedIncSubtensor1,
                       theano.sandbox.gpuarray.blas.GpuGemm,
                       theano.sandbox.gpuarray.blas.GpuGemv,
-                      #theano.sandbox.gpuarray.blas.GpuGer, Not Yet implemented
+                      theano.sandbox.gpuarray.blas.GpuGer,
                   ))):
                 return False
             #If the clients is a transfer, we don't want to fold. We