[llvm] [PGO] Sampled instrumentation in PGO to speed up instrumentation binary (PR #69535)

[via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt < %s --passes=instrprof --sampled-instrumentation --sampled-instr-burst-duration=1 --sampled-instr-period=1009 -S | FileCheck %s
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WenleiHe wrote:

Can we also have a test with `--sampled-instr-burst-duration=1` and the default `--sampled-instr-period=65535`?

https://github.com/llvm/llvm-project/pull/69535