[llvm-dev] Disable combining of loads and stores in instcombine

[Neil Ryan via llvm-dev]

> Why do you want this?

The goal is to share arrays between multiple tiles on a manycore architecture by splitting arrays between tiles. With a DRF memory model, it makes sense to elide multiple loads to the same memory location between barriers.; IIRC the semantics for volatile don’t allow this eliding.
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