[clang] [Clang] Add float type support to __builtin_reduce_add and __builtin_reduce_multipy (PR #120367)

[Farzon Lotfi via cfe-commits]

farzonl wrote:

@Il-Capitano  @RKSimon could I get another review of this PR? Thanks in advance!

https://github.com/llvm/llvm-project/pull/120367