Update and extend existing INSTR_CREATE_nop macros

xref #3828

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.

Start by reading the existing INSTR_CREATE_nop macros, then compare their byte sequences with the versions added by #3868. Inspect api.ir for the current API tests. Done means updating the existing multi-byte nop macros, adding INSTR_CREATE_RAW_nop9byte() and the intervening versions, and adding coverage for the new macros.

Written by the indexing model from the issue text.