[clang] [llvm] clang: Use TargetID parsing from AMDGPUTargetParser (PR #209845)

[Kewen Meng via cfe-commits]

Kewen12 wrote:

It seems to fail the check-offload tests. Do we need any other changes? Thanks!

```
clang: error: invalid target ID 'gfx90a'; format is a processor name followed by an optional colon-delimited list of features followed by an enable/disable sign (e.g., 'gfx908:sramecc+:xnack-')
```

https://lab.llvm.org/buildbot/#/builders/234/builds/1391


https://github.com/llvm/llvm-project/pull/209845