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

[Craig Topper via llvm-commits]

topperc 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.

You changed the codegen for 2 memcpy tests, but do not mention that in the patch description.

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