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This is primarily useful for heap allocations, as a two-address 'add'
can't be used to both copy the heap pointer to another register, and add
the tag.
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The x86 backend crashes if certain RTL optimisations were omitted,
preventing it from being usable at lower optimisation levels.
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RTL can produce an #fconv{} instruction with an immediate operand, but
the backends unconditionally access the operand as a temporary. This
results in broken representation in the backends and eventually they
crash.
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