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Since a26ec542371652e1d774696e90016fd5b0b1c191, we expand the executable name to an absolute path, if it isn't already one, if found in path. This broke a couple tests in some environments; when the clang workdir resides in a path under e.g. /opt. Tests that only use a tool name like "clang-cl" would get expanded to the absolute path in the build tree. The loop for finding the last "-o" like option for clang-cl command lines would inspect all arguments, including Args[0] which is the executable name itself. As an /opt path matches Arg.starts_with("/o"), this would get detected as an object file output name in cases where there was no other explicit output argument. Thus, this fixes those tests in workdirs under e.g. /opt. (cherry picked from commit cead9044a995910306e2e64b426fcc8042d7e0ef)