[llvm] [VPlan] Use vputils::findCanonicalIVIncrement in more places. NFC (PR #226516)

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@llvm/pr-subscribers-llvm-transforms

Author: Luke Lau (lukel97)

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<summary>Changes</summary>

In a future patch we want to enable more scenarios with early exits and tail folding. In these scenarios the terminator will no longer be a BranchOnCount/BranchOnCond but a BranchOnTwoConds, so a bunch of canonical IV matchers break. Use vputils::findCanonicalIVIncrement instead since it searches the users of the canonical IV instead of looking at the terminator.


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Full diff: https://github.com/llvm/llvm-project/pull/226516.diff


3 Files Affected:

- (modified) llvm/lib/Transforms/Vectorize/LoopVectorize.cpp (+2-9) 
- (modified) llvm/lib/Transforms/Vectorize/VPlanConstruction.cpp (+2-8) 
- (modified) llvm/lib/Transforms/Vectorize/VPlanEVLTailFolding.cpp (+7-13) 


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https://github.com/llvm/llvm-project/pull/226516