[llvm] [MergeFunctions] Preserve instruction-level profile metadata during merging (PR #208009)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-nvptx64-nvidia-ubuntu` running on `as-builder-7` while building `llvm` at step 6 "test-build-unified-tree-check-llvm".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/160/builds/41580

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

```
Step 6 (test-build-unified-tree-check-llvm) failure: test (failure)
******************** TEST 'LLVM-Unit :: Transforms/IPO/./IPOTests/19/22' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/build/unittests/Transforms/IPO/./IPOTests-LLVM-Unit-1326921-19-22.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=22 GTEST_SHARD_INDEX=19 /home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/build/unittests/Transforms/IPO/./IPOTests
--

Note: This is test shard 20 of 22.
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from MergeFunctionsTest
[ RUN      ] MergeFunctionsTest.TrueOutputFunctionsTest
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  libLLVMSupport.so.24.0git     0x00007536f602ff71 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 65
1  libLLVMSupport.so.24.0git     0x00007536f602c87c llvm::sys::RunSignalHandlers() + 76
2  libLLVMSupport.so.24.0git     0x00007536f602c9de
3  libc.so.6                     0x00007536f5645330
4  IPOTests                      0x0000614393040123
5  IPOTests                      0x000061439303eb75
6  IPOTests                      0x000061439303eff7
7  libllvm_gtest.so.24.0git      0x00007536f7b1286d testing::TestInfo::Run() + 397
8  libllvm_gtest.so.24.0git      0x00007536f7b22cd9
9  libllvm_gtest.so.24.0git      0x00007536f7b236aa testing::internal::UnitTestImpl::RunAllTests() + 2218
10 libllvm_gtest.so.24.0git      0x00007536f7b06c10 testing::UnitTest::Run() + 112
11 libllvm_gtest_main.so.24.0git 0x00007536f7b4caf8 main + 104
12 libc.so.6                     0x00007536f562a1ca
13 libc.so.6                     0x00007536f562a28b __libc_start_main + 139
14 IPOTests                      0x000061439300d365

--
exit: -11
--
shard JSON output does not exist: /home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/build/unittests/Transforms/IPO/./IPOTests-LLVM-Unit-1326921-19-22.json
********************


```

</details>

https://github.com/llvm/llvm-project/pull/208009