[CIR] Fix spurious MemRead on pure pointer-arithmetic ops (#185154) Remove incorrect [MemRead] annotations from seven CIR ops that only perform pointer arithmetic, and add the Pure trait where missing. - VTableGetVPtrOp computes the address of the vptr slot within an object. Since the vptr is always at offset zero, this is a bitcast — confirmed by the lowering which does replaceOp(op, srcVal). No memory access. - VTableGetVirtualFnAddrOp takes an already-loaded !cir.vptr value and an index, computes the address of the nth vtable entry. Lowers to a GEPOp. No memory access. - VTableGetTypeInfoOp takes an already-loaded !cir.vptr value, computes the address of the type_info entry at a known ABI offset. Pointer arithmetic only. No memory access. - GetMemberOp computes the address of a struct/class member given a base pointer and a constant index. Lowers to GEPOp (struct/class) or BitcastOp (union). No memory access. - GetRuntimeMemberOp computes a member address using a runtime pointer-to-data-member value. Lowers to CastOp + PtrStrideOp (byte-level pointer arithmetic). No memory access. - BaseClassAddrOp computes the base class address from a derived class pointer using a byte offset. Lowers to GEPOp/BitcastOp with a null check when needed. No memory access. - DerivedClassAddrOp computes the derived class address from a base class pointer using a negative byte offset. Lowers to GEPOp with a null check when needed. No memory access. In all cases, the actual memory reads are performed by separate cir.load ops that follow these address computations.
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