Add int<->float reinterpretation #40
Merged
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These are basic LLVM ops that are missing and currently require heap loads/stores in asm.js.
Note, currently float64 is excluded. Post-v.1, when we add int64, we could add the int64<->float64 reinterpret ops and then to get the lower 32 bits of a float64, you'd first reinterpret as int64 and then truncate to int32.