* symbols.h (dot_symbol): New declaration.

	* symbols.h (dot_symbol): New declaration.
	(dot_symbol_init): New prototype.
	* symbols.c (dot_symbol): New variable.
	(symbol_clone): Assert it's not dot_symbol being cloned.
	(dot_symbol_init): New function.
	(symbol_clone_if_forward_ref): Create a new temporary symbol
	when trying to clone dot_symbol.
	* expr.c (current_location): Refer to dot_symbol instead of
	making a new temporary symbol.
	* read.c (read_a_source_file): Update dot_symbol as we go.
	* as.c (main): Call dot_symbol_init.