[llvm] [SLP]Fix narrowed leaf masks for demoted reduction root (PR #227009)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: Alexey Bataev (alexey-bataev)

<details>
<summary>Changes</summary>

The root of the narrowed-leaf reduction may be demoted and resized to the
reduction bitwidth of the wide reduction operations, while the masks are
built for the narrow leaves type, causes the crash.

Fixes https://github.com/llvm/llvm-project/pull/224919#issuecomment-5869787812


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Full diff: https://github.com/llvm/llvm-project/pull/227009.diff


2 Files Affected:

- (modified) llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp (+9-1) 
- (added) llvm/test/Transforms/SLPVectorizer/X86/narrowed-reduction-minbw-root.ll (+60) 


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</details>


https://github.com/llvm/llvm-project/pull/227009