as.info: Func

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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'.