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

[Rahman Lavaee via llvm-commits]

rlavaee wrote:

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

Correct. Fixed the function comment.

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