brw_blorp_clear.cpp: In member function ‘const GLuint* brw_blorp_const_color_program::compile(brw_context*, GLuint*)’:
brw_blorp_clear.cpp:204:26: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
base_mrf >= 0 ? brw_message_reg(base_mrf) : mrf_rt_write,
I don't think this code exists anymore.