Adding ifdefs around nvcc-specific pragmas

[hyperbolic2346]

Description

This change wraps the NVCC-specific #pragma macros inside an ifdef to prevent compilation warnings as described in issue #13106

closes #13106

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[hyperbolic2346]

I thought about making a macro for this, but it seemed like this didn't hit the threshold of change required to warrant it.

[bdice]

I thought about making a macro for this, but it seemed like this didn't hit the threshold of change required to warrant it.

Agreed. I support what you did here.

[hyperbolic2346]

/merge