[llvm] [X86] For inline memset with minsize, use stosb or stosd (PR #87003)

[Rose Silicon via llvm-commits]

RSilicon wrote:

> Your patch describes memset yet most of the changes appear to be for memcpy :/

Incorrect. The memset code was refactored to use the same method as the memcpy code for determining block size.

https://github.com/llvm/llvm-project/pull/87003