Defines starting with `p' in EXTERNAL_HEADERS/architecture/ppc

• PICIFY_REG EXTERNAL_HEADERS/architecture/ppc/asm_help.h:375
• PPC_NFP_REGS EXTERNAL_HEADERS/architecture/ppc/fp_regs.h:114
• PPC_NGP_REGS EXTERNAL_HEADERS/architecture/ppc/basic_regs.h:49