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i64 reinterprets were lowered in the i64 pass, and i32s at the very end, in
wasm2js itself. This could break since in between the i64 pass and wasm2js
we run optimizations, and the optimizer was not aware of what we lower
the i32 reinterprets to - calls to use scratch memory. Those calls have a
side effect of altering scratch memory. The optimizer just saw an i32
reinterpret, and moved it across the i64 reinterpret's scratch memory calls.
This makes 32-bit reinterprets use separate scratch memory from 64-bit ones,
which means they can never interfere with each other.
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We don't ever emit "use asm" anymore, so this similar annotation is not really useful, it just increases size.
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This happens on e.g. an i32 load of a constant offset, then we have constant >> 2.
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This helps quite a lot on wasm2js.
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In JS a reinterpret is especially expensive, as we implement it as a write to a temp buffer and a read using another view. This finds places where we load a value from memory, then reinterpret it later - in that case, we can load it using another view, at the cost of another load and another local.
This is helpful on things like Box2D, where there are many reinterprets due to the main 2D vector class being an union over two floats/ints, and LLVM likes to do a single i64 load of them.
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When loading a boolean, prefer the signed heap (which is more commonly used, and may be faster).
We never use HEAPU32 (HEAP32 is always enough), just remove it.
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A minifier would probably remove them later anyhow, but they make reading the code annoying and hard.
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In particular, coalesce-locals is useful even if closure is run later (apparently it finds stuff closure can't).
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We flatten for the i64 lowering etc. passes, and it is worth optimizing afterwards, to clean up stuff they created. That is run if the user ran wasm2js with an optimization level (like wasm2js -O3).
Split the test files to check both optimized and unoptimized code.
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