[compiler-rt] [builtins] Support building the 128-bit float functions on ld80 platforms (PR #68132)

[Pranav Kant via llvm-commits]

pranavk wrote:

Looks mostly good to me. Some tweaks are required after @alexander-shaposhnikov PR got merged: enabling tests, refactoring, etc.  



https://github.com/llvm/llvm-project/pull/68132