[clang] [lldb] [llvm] [llvm][TargetParser] Return optional from getHostCPUFeatures (PR #97824)

[David Spickett via cfe-commits]

DavidSpickett wrote:

Fair point, iirc all the callers go on to iterate the map so no one is handling failure in a special way. I'll update this.

https://github.com/llvm/llvm-project/pull/97824