Fix for HIP compilation failure in DenseBase.

Rohit Santhanamrequested to merge
rohitsan/eigen:hip_densebase_fix into master

Commit 96e537d6 introduced EIGEN_DEVICE_FUNC modifiers to some DenseBase functions.

The corresponding functions in DenseBase.h were missing the modifiers and this caused a compilation failure in HIP.

/cc @cantonios

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