Update and extend existing INSTR_CREATE_nop macros

xref #3828 (closed)

This issue covers and requests updating the multi-byte nops INSTR_CREATE macros with the byte sequences as recently added by #3868

e.g. update instr_create_nbyte_nop(), INSTR_CREATE_RAW_nop2byte() etc, and add versions up to INSTR_CREATE_RAW_nop9byte()

This issue also covers adding a test to api.ir for the new macros.