8d9299cd7a
This adds support for the following kinds of formats: * Hexadecimal literals like 0x1.fp13 * Special values +inf/-inf, +qnan/-qnan * NaN values with payloads like +nan(0x1) Additionally, the floating-point hexadecimal format that records the bitpattern exactly no longer requires the 0xL or 0xK or similar code for the floating-point type. The current hexadecimal syntax is retained for the moment, but it is expected to be ripped out after the next release of LLVM. These changes were discussed in an RFC at https://discourse.llvm.org/t/rfc-floating-point-literals-in-llvm-ir/82974.