[llvm] [SLP][NFC] Use BoUpSLP::getNumberOfParts() where appropriate (PR #225995)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-vectorizers

Author: Ryan Buchner (bababuck)

<details>
<summary>Changes</summary>

Caches the results for better performance rather than directly calling slpvectorizer::getNumberOrParts().

Small improvement in compile time.

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Full diff: https://github.com/llvm/llvm-project/pull/225995.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp (+19-29) 


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</details>


https://github.com/llvm/llvm-project/pull/225995