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* Move wasm2asm test outputs into their natural location, test/wasm2asm/
* Let people create new tests in there that ./auto_update_tests.py will auto-generate outputs for, just like all the other tests.
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If locals are known to contain the same value, we can
* Pick which local to use for a get_local of any of them. Makes sense to prefer the most common, to increase the chance of one dropping to zero uses.
* Remove copies between a local and one that we know contains the same value.
This is a consistent win, small though, around 0.1-0.2%.
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When lowering i64 values in a function, we create new local variables
for all of the i64 local variables, one local for the low bits, and one
for the high bits. We create a mapping between the old locals and the
new as well. During translation, when we encountered a `get_local` that
didn't have type `i64`, we skipped it, on the supposition that there was
nothing to do. But that's not true; the local it was getting may have
been remapped to a new index in the lowered function, and we need to
account for that change. Similar logic holds for `set_local`.
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