Add test case for local memory initializer.

Signed-off-by: Rami Ylimäki <rami.ylimaki@vincit.fi>
Make it possible to adjust arguments easily.

We are forcing files to be treated as OpenCL C and therefore it's not
possible for the user to set the file type incorrectly anymore.

Signed-off-by: Rami Ylimäki <rami.ylimaki@vincit.fi>