GAS x64 for Linux (verified working on GCC 9.2.0):
13 12 instructions, 148 136 129 byte data section, 298 274 260 source
No standard library (including printf) allowed. This contaminates the assembly.
Faults are ok as long as it outputs the quine to stdout.
No main allowed. Puts extra garbage in the program.
No .incbin ...