[llvm] [ValueTracking] Conservative NoSync check prevents vectorization (PR #199002)

[Kshitij Paranjape via llvm-commits]

kshitijvp wrote:

> Is there a reason to re-posting this as a new PR again instead of just updating the existing one? It is very hard to keep track of the comments

There was some problem with the previous PR and Nikic wasn't able to add reviews so had to open a new one.

https://github.com/llvm/llvm-project/pull/199002