Bindings: Expect memory growth when lowering references

[dcodeIO]

Fixes #2553 by using a helper function when lowering (what's typically) another lowering to memory:

new Uint32Array(memory.buffer)[pointer >>> 2] = __lowerXY(...);
// ->
__store_ref(pointer, __lowerXY(...));

Changes evaluation order so the LHS view is not invalidated by memory growth in the RHS before the store is performed.

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