[IR] Remove Intrinsic::getDeclaration (#152645)
Intrinsic::getDeclaration has been deprecated for more than 9 months
since:
commit b9f08676abcfbb226c67b5ac2a7bc5b33254b915
Author: Rahul Joshi <rjoshi@nvidia.com>
Date: Mon Oct 14 19:21:28 2024 -0700
This patch removes it. I'm not aware of any downstream use AFAIK.
