[llvm] [ARM] Protect against multi use increment in gather scatter combine (PR #227247)

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@llvm/pr-subscribers-backend-arm

Author: David Green (davemgreen)

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<summary>Changes</summary>



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Full diff: https://github.com/llvm/llvm-project/pull/227247.diff


2 Files Affected:

- (modified) llvm/lib/Target/ARM/MVEGatherScatterLowering.cpp (+1-9) 
- (modified) llvm/test/CodeGen/Thumb2/mve-gather-increment.ll (+93-20) 


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https://github.com/llvm/llvm-project/pull/227247