bors 959e483fb7 auto merge of #5235 : yjh0502/rust/io_float, r=graydon
When parsing bytes from a wire, there is a need to parse floating-point bytes to float values ([u8*4] to f32, [u8*8] to f64). This can be done via cast::transmute, but there is no way to do it safely.

It's quite common, so I think I't better to support it in core library.
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