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LLVM has some utilities to print statistics about PGO data. Let's print a few views so we can better debug PGO instrumentation.
This is more reliable. See comment in added patch for context.
Contrary to popular belief, the system doesn't need to be "idle" to collect profiling data. See inline comment + https://github.com/llvm/llvm-project/blob/main/llvm/lib/Transforms/Instrumentation/PGOInstrumentation.cpp for the PGO implementation for the evidence.
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Some of these are good candidates for up-streaming. Although we make assumptions about availability of [modern] LLVM. So upstream patches may require configure work to sniff toolchain capabilities. It was vastly easier to implement the simple patches in PBS first.