[llvm] [LV] Enable auto-vectorisation of loops with uncountable exits (PR #133099)

[Paul Walker via llvm-commits]

paulwalker-arm wrote:

It sounds like there's an existing bug that will affect those using `-enable-early-exit-vectorization`, so ignoring hints that are known to produce mis-compiles or compiler crashes is generally a good thing to do regardless of whether the default is changed or not.

https://github.com/llvm/llvm-project/pull/133099