[libc-commits] [libc] [llvm] [reland][libc][NFC] Use user defined literals to build 128 and 256 bit constants (PR #81835)

[Guillaume Chatelet via libc-commits]

gchatelet wrote:

Only `libc/src/__support/integer_literals.h` needs to be reviewed.

https://github.com/llvm/llvm-project/pull/81835