AlignmentLowering: Handle all possible cases for i64, f32, f64 (#3008)

Previously we only handled i32. That was enough for all real-world code
people have run through wasm2js apparently (which is the only place the
pass is needed - it lowers unaligned loads to individual loads etc., as
unaligned operations fail in JS). Apparently it's pretty rare to have
unaligned f32 loads for example.

This will be useful in fuzzing wasm2js, as without this we can't compare
results to the interpreter (which does alignment properly).

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