[llvm] [ABI] Add DefaultTargetInfo for default argument/return classification (PR #225009)

[via llvm-commits]

skc7 wrote:

> I see that Clang has a DefaultABIInfo class that does something similar to this, but I'd rather keep the structure there than have the ABI library's TargetInfo provide these default functions. It will make review of each target that uses them easier.

Updated this PR to create `DefaultTargetInfo` class and moved the argument/return classification methods.

https://github.com/llvm/llvm-project/pull/225009