Tests for `intrinsics::mem::store_sw/load_sw`

[Denys Zadorozhnyi]

Use IR's store and load calls for i32 type values under proptest and cover the pattern used by rustc of using Wasm i32.load/store ops. We want to also test OpEmmiter::emit_native_ptr (raw<->native ptr translation) as part of these tests.

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1. failing assert in replace_element;
2. returns 0 in some cases (seems like when ptr % 4 == 0);
3. out of bounds memory access on some ptrs;

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