as: Func
7.38 '.func NAME[,LABEL]'
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'.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'.