[llvm] [PGO] Drive profile validator from opt (PR #147418)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-ppc64-aix` running on `aix-ppc64` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/64/builds/5043

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM-Unit :: Support/./SupportTests/152/191' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/home/llvm/llvm-external-buildbots/workers/aix-ppc64/clang-ppc64-aix/build/unittests/Support/./SupportTests-LLVM-Unit-47579488-152-191.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=191 GTEST_SHARD_INDEX=152 /home/llvm/llvm-external-buildbots/workers/aix-ppc64/clang-ppc64-aix/build/unittests/Support/./SupportTests
--

Script:
--
/home/llvm/llvm-external-buildbots/workers/aix-ppc64/clang-ppc64-aix/build/unittests/Support/./SupportTests --gtest_filter=ProgramEnvTest.TestExecuteNoWaitTimeoutPolling
--
Note: Google Test filter = ProgramEnvTest.TestExecuteNoWaitTimeoutPolling
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from ProgramEnvTest
/home/llvm/llvm-external-buildbots/workers/aix-ppc64/clang-ppc64-aix/llvm-project/llvm/unittests/Support/ProgramTest.cpp:413: Failure
Expected: (LoopCount) > (1u), actual: 1 vs 1
LoopCount should be >1


/home/llvm/llvm-external-buildbots/workers/aix-ppc64/clang-ppc64-aix/llvm-project/llvm/unittests/Support/ProgramTest.cpp:413
Expected: (LoopCount) > (1u), actual: 1 vs 1
LoopCount should be >1



********************


```

</details>

https://github.com/llvm/llvm-project/pull/147418