[LNT] Parse --version correctly from CMake builds

[James Molloy]

Hi Yi, Chris,

 

LNT currently fails to parse clang's -version string correctly for CMake
builds. CMake builds do not emit the branch name, they only emit the
revision. Currently LNT thinks the revision number is the branch name, which
also means it fails to infer the run_order correctly for submission.

 

The attached simple patch fixes this.

 

OK to commit?

 

Cheers,

 

James
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