[llvm] [llvm-profdata] Enabled functionality to write split-layout profile (PR #101795)

[via llvm-commits]

WenleiHe wrote:

Update change summary: split_layout -> split-layout

> but previously there is no way to use it from llvm-profdata.

How was it previously used? 



https://github.com/llvm/llvm-project/pull/101795