Disable more NVCC warnings.

The 2979 warning is yet another "calling a __host__ function from a
__host__ device__ function.  Although we probably should eventually
address these, they are flooding the logs.  Most of these are
harmless since we only call the original from the host.
In cases where these are actually called from device, an error is generated
instead anyways.

The 2977 warning is a bit strange - although the warning suggests the
`__device__` annotation is ignored, this doesn't actually seem to be
the case.  Without the `__device__` declarations, the kernel actually
fails to run when attempting to construct such objects.  Again,
these warnings are flooding the logs, so disabling for now.

Eigen/src/Core/util/DisableStupidWarnings.h

@@ -94,6 +94,12 @@
   #pragma diag_suppress 2735
   #pragma diag_suppress 2737
   #pragma diag_suppress 2739
+  #pragma diag_suppress 2979
+  // Disable the "// __device__ annotation is ignored on a function(...) that is
+  //              explicitly defaulted on its first declaration" message.
+  // The __device__ annotation seems to actually be needed in some cases,
+  // otherwise resulting in kernel runtime errors.
+  #pragma diag_suppress 2977
 #endif
 
 #else