[clang] [llvm] CodeGen, IR: Add target-{cpu,features} attributes to functions created via createWithDefaultAttr(). (PR #96721)

[via cfe-commits]

pcc wrote:

https://discourse.llvm.org/t/functions-generated-by-function-createwithdefaultattr-should-respect-target-features/79838

https://github.com/llvm/llvm-project/pull/96721