[clang] [llvm] [CodeView] Flatten cmd args in frontend for LF_BUILDINFO (PR #106369)

[Alexandre Ganea via llvm-commits]

aganea wrote:

> Maded the suggested changes. Continuing looking into the failing tests. This is my first llvm pr and I need some time to figure out the issues those are indicating and replicating those locally.

I recommend that you build a Debug target, ie. `cmake -DCMAKE_BUILD_TYPE=Debug -DLLVM_OPTIMIZED_TABLEGEN=ON -DLLVM_ENABLE_ASSERTIONS=ON` to ease debugging in Visual Studio. You can then run a specific test such as: `py buildfolder\bin\llvm-lit.py -vv -a llvm/DebugInfo/COFF/types-data-members.ll`. You'll see the commands executed for that test and their command-line, so you will be able to reproduce them.

I think in the specific case the tests are failing because the `LF_BUILDINFO` is somehow emitted slightly differently from what was there before your PR. Either fix the test files are fix the code to match what the tests are expected.

https://github.com/llvm/llvm-project/pull/106369