[clang] [profile] Add a clang option -fprofile-continuous that enables continuous instrumentation profiling mode (PR #124353)

[Hubert Tong via cfe-commits]

https://github.com/hubert-reinterpretcast commented:

@w2yehia, I suggest adding an update to the Release Notes sooner rather than later: https://github.com/llvm/llvm-project/blob/main/clang/docs/ReleaseNotes.rst

https://github.com/llvm/llvm-project/pull/124353