Zain Jaffal 23a1c0a779
[instcombine] Test for zero initialisation optimisation of integer product
Following the work on `D131672` we do the same optimisations for integer products.
We add tests to check if a loop gets removed if we repeatdly multiply an array elements with an accumulator initalised to zero

Reviewed By: fhahn

Differential Revision: https://reviews.llvm.org/D132553
2022-08-24 15:54:20 +01:00
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