[llvm] [BasicBlockSections] Introduce the basic block sections profile version 1. (PR #65506)

[Han Shen via llvm-commits]

https://github.com/shenhanc78 commented:

`f <function name 1> <function name 2>`
So func name 1 and func name 2 are aliaes, right?

https://github.com/llvm/llvm-project/pull/65506