[llvm] [MachinePipeliner] Make Recurrence MII More Accurate (PR #105475)

[Michael Marjieh via llvm-commits]

mmarjieh wrote:

@kasuga-fj @ytmukai 
Can someone submit on my behalf? I don't have write permissions.
Make sure to squash the commits and use the following commit message:

[MachinePipeliner] Make Recurrence MII More Accurate

Current RecMII calculation is bigger than it needs to be.
The calculation was refined in this patch.

https://github.com/llvm/llvm-project/pull/105475