Variables starting with `r' in src/cpu/jit

• raw_cputbl_count src/cpu/jit/compemu_support_codegen.c:133
• reg_alloc_run src/cpu/jit/compemu_support.c:48
• reg_count src/cpu/jit/compemu_support_codegen.c:112
• reg_count_local src/cpu/jit/compemu_support_codegen.c:113