[llvm] [Instrumentation] Fix EdgeCounts vector size in SetBranchWeights (PR #99064)

[Kefu Chai via llvm-commits]

tchaikov wrote:

this is the failed test:

```
[830/1003] Running unit test libc.test.src.stdio.fscanf_test.__unit__
FAILED: projects/libc/test/src/stdio/CMakeFiles/libc.test.src.stdio.fscanf_test.__unit__ /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/build/projects/libc/test/src/stdio/CMakeFiles/libc.test.src.stdio.fscanf_test.__unit__ 
cd /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/build/projects/libc/test/src/stdio && /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian/libc-x86_64-debian-dbg/build/projects/libc/test/src/stdio/libc.test.src.stdio.fscanf_test.__unit__.__build__
[==========] Running 1 test from 1 test suite.
[ RUN      ] LlvmLibcFScanfTest.WriteToFile
Segmentation fault
```

not sure if it is relevant.

https://github.com/llvm/llvm-project/pull/99064