[LICM] Support hoisting of non-argmemonly readonly calls (#144497) The code checking whether a readonly call is safe to hoist is currently limited to only argmemonly calls. However, the actual implementation does not depend on this in any way. It either does an MSSA clobber walk on the memory access (which will take all locations accessed by the call into account), or it will look at all MemoryDefs in an entirely location-independent manner. The current restriction dates back to the time when LICM still supported AST, in which case this code *did* reason about the individual pointer arguments.
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