[swift-evolution] f suffix for float32 literals, h suffix for float16 literals

[nick ralabate]

I think it would be helpful for graphics programmers to specify vertex data
inline without surrounding every value with Float(4.0).

Something like this:

let vertexData = [ 1.0f, 0.0f, 0.5f, 1.0f ]

Also, it would be great if Swift had a type for half-floats to match the
iPhone GPU:

let vertexData = [ 1.0h, 0.0h, 0.5h, 1.0h]


Thanks!
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