Fix spvc test logging (#616)
Fix spvc test logging (#616)

Use explicit list comprehension to map the command elements to strings.
Otherwise I get a "map object is not indexible" error when evaluating
cmd[0] two lines later.
dneto0/shaderc,dneto0/shaderc,antiagainst/shaderc,dneto0/shaderc,antiagainst/shaderc,antiagainst/shaderc,dneto0/shaderc,antiagainst/shaderc