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Richard Smith
28103b8f2e
* Rename the type.
* Change lowering to lower FloatLiteralType values as the placeholder
`{}` value we use for literals instead of as an LLVM f64.
* Change eval to convert the type as part of a floating point
conversion, so that lowering can lower converted constants properly.
For now we still represent a value of FloatLiteralType as a
double-precision APFloat. (That will need to change so that we can
losslessly convert literals to f80 / f128 values, and so that we can
convert literals to f32 values without double-rounding.)