[NNC] removed the second run of llvm passmanager - it is repeated and caused a slowdown in the generated code (#56837)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/56837
Test Plan: Imported from OSS
Reviewed By: ZolotukhinM
Differential Revision: D27980073
Pulled By: huiguoo
fbshipit-source-id: 4bc821adb7bba67078f0a4cb3294143f701f5335
