[clang] [Clang][CMake] Support perf, LBR, and Instrument CLANG_BOLT options (PR #69133)

[David Spickett via cfe-commits]

DavidSpickett wrote:

https://lab.llvm.org/buildbot/#/builders/245/builds/19468

```
CMake Error at /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/utils/perf-training/CMakeLists.txt:105 (add_custom_target):
  Error evaluating generator expression:
    $<TARGET_FILE:merge-fdata>
  No target "merge-fdata"
```

This particular bot is clang+llvm and only the ARM target, but we've seen it on our AArch64 bots too. 

https://github.com/llvm/llvm-project/pull/69133