Philip Reames 650dca5d89 [IR] Remove the AtomicMem*Inst helper classes (#138710) ...

Migrate their usage to the `AnyMem*Inst` family, and add a isAtomic()
query on the base class for that hierarchy. This matches the idioms we
use for e.g. isAtomic on load, store, etc.. instructions, the existing
isVolatile idioms on mem* routines, and allows us to more easily share
code between atomic and non-atomic variants.

As with #138568, the goal here is to simplify the class hierarchy and
make it easier to reason about. I'm moving from easiest to hardest, and
will stop at some point when I hit "good enough". Longer term, I'd sorta
like to merge or reverse the naming on the plain Mem*Inst and the
AnyMem*Inst, but that's a much larger and more risky change. Not sure
I'm going to actually do that.

2025-05-06 14:24:40 -07:00

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