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.func name[,label].func emits debugging information to denote function name, and
is ignored unless the file is assembled with debugging enabled.
Only `--gstabs[+]' is currently supported.
label is the entry point of the function and if omitted name
prepended with the `leading char' is used.
`leading char' is usually _ or nothing, depending on the target.
All functions are currently defined to have void return type.
The function must be terminated with .endfunc.