[nnc] Updated sliceHead to do inplace mutation (#63531)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/63531
Test Plan: Imported from OSS
Reviewed By: ZolotukhinM
Differential Revision: D30412183
Pulled By: navahgar
fbshipit-source-id: 47ee9482a36e606788d28d22eee4edaca45ffa50
