Found a different way to add parameter data to Herd: by putting it into the gpu_data field of the test record.
Finished renaming "CPP11" to "C". C files can now contain type annotations for local variables. E.g. one can write "int r0 = 5" or "r0 = 5" and it makes no difference, since we assume that all the r0, r1, r2, ... registers are already declared.
More work on C parser