m68k GAS uses `|` as the comment character instead of `#`.
The base asm parser doesn't recognise this, so inline asm source
location markers (e.g. `| 2 "file.c" 1`) leak through into the output
instead of being filtered.
Repro on godbolt.org: https://godbolt.org/z/vYneWc8Tf
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Co-authored-by: Patrick Quist <partouf@gmail.com>