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781bfb732b
This was broken by 16295d521e294b27106e51fac29957c1aac8ff89, when instructions started being handled and not just constant expressions. This was re-inserting an equivalent bitcast to the original memcpy operand, which made a non-functional IR change on every iteration. This also fixes a secondary problem where it was inserting addrspacecasts which may not have been legal (i.e. it changed the source address space). Start visiting all pointer users and fail out if we can't process them. Also start handling the relevant memory intrinsic users. These cases can be dealt with by running InferAddressSpaces separately.
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