Test on ppc64le and armv7l as well
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Because armv7 opcodes are only 32 bits, `mov` can only move immediates that are 8 bits or less. There's some wiggle room with shifting and whatnot, but in full generality you need to actually perform a load from a memory address. The assembler will insert the immediate into a literal pool, but that pool has to be <4KB away from the current `pc` at the time of load, so we add `.ltorg` to flush the literal pool at the end of every function.
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