[llvm] [IR][AsmParser] Revamp how floating-point literals work in LLVM IR. (PR #121838)

[Jay Foad via llvm-commits]

https://github.com/jayfoad commented:

> 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. This format is removed from the documentation, but is still supported as a legacy format in the parser.

Personally I'd prefer that anything that's supported is documented, even if it is documented as deprecated.

https://github.com/llvm/llvm-project/pull/121838