[compiler-rt] [llvm] [Coverage] Ignore unused functions if the count is 0. (PR #107661)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ml-opt-devrel-x86-64` running on `ml-opt-devrel-x86-64-b2` while building `compiler-rt,llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/175/builds/4881

<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 :: ProfileData/./ProfileDataTests/22/29' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/b/ml-opt-devrel-x86-64-b1/build/unittests/ProfileData/./ProfileDataTests-LLVM-Unit-1653782-22-29.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=29 GTEST_SHARD_INDEX=22 /b/ml-opt-devrel-x86-64-b1/build/unittests/ProfileData/./ProfileDataTests
--

Script:
--
/b/ml-opt-devrel-x86-64-b1/build/unittests/ProfileData/./ProfileDataTests --gtest_filter=ParameterizedCovMapTest/CoverageMappingTest.uncovered_function/1
--
/b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/unittests/ProfileData/CoverageMappingTest.cpp:746: Failure
Expected equality of these values:
  2U
    Which is: 2
  Segments.size()
    Which is: 0


/b/ml-opt-devrel-x86-64-b1/llvm-project/llvm/unittests/ProfileData/CoverageMappingTest.cpp:746
Expected equality of these values:
  2U
    Which is: 2
  Segments.size()
    Which is: 0



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


```

</details>

https://github.com/llvm/llvm-project/pull/107661