[llvm] [VectorCombine] Scalarize binop-like intrinsics (PR #138095)

[Simon Pilgrim via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt < %s -S -p vector-combine | FileCheck %s
+
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RKSimon wrote:

do we have any tests that we can get different results based off costs? might need to be moved into a specific target?

https://github.com/llvm/llvm-project/pull/138095