[clang] [llvm] Treat specifying a function in the bbsection profile without any directive as noop. (PR #167359)

[David Spickett via cfe-commits]

DavidSpickett wrote:

```
$ ./bin/lldb-dotest -p TestStepUntilAPI.py
```
And it'll tell you why they were unsupported.

I'm looking at the failure on AArch64 Linux right now.

https://github.com/llvm/llvm-project/pull/167359