Add "dont_generate_debug_code" syntax handling to aicasm_gram.y aic79xx.reg, aic7xxx.reg: add dont_generate_debug_code keyword for registers which are never referenced by the driver. aicasm.c, aicasm_symbol.[ch]: don't emit code for those regs; also add "const" keyword to generated code in few places. Signed-off-by: Denys Vlasenko -- vda