Prepare Pika for coupledGradient() const reference return value.

idaholab / pika

Phase-field snow microstructure

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Closed jwpeterson closed 8 years ago

jwpeterson commented 8 years ago

This set of changes prepares Pika to work with an upcoming version of MOOSE in which coupledGradient() returns a const reference.

Refs idaholab/moose#6327.