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[llgo]: fix compilation under current llvm

Description

[llgo]: fix compilation under current llvm

Patch rL322965 changed how intrinsics for memset and memzero
were defined. This causes a regression in LLGO making it no
longer buidable. In addition to that one pass was renamed,
so this also addresses the pass naming disparity.

I removed all split stack related bits from this patch as
as asked.

Differential Revision: https://reviews.llvm.org/D56638