Instead of using make_symbol<TOK_FOO>, generate make_FOO for each token type.

Instead of using make_symbol<TOK_FOO>, generate make_FOO for each token type.

Using template buys us nothing, and makes it uselessly complex to
construct a symbol.  Besides, it could not be generalized to other
languages, while make_FOO would work in C/Java etc.

	* data/lalr1.cc (b4_symbol_): New.
	(b4_symbol): Use it.
	(b4_symbol_constructor_declaration_)
	(b4_symbol_constructor_definition_): Instead of generating
	specializations of an overloaded template function, just generate
	several functions whose names are forged from the token names
	without the token.prefix.
	(b4_symbol_constructor_declarations): Generate them for all the
	symbols, not just by class of symbol type, now that instead of
	specializing a function template by the token, we generate a
	function named after the token.
	(b4_symbol_constructor_specialization_)
	(b4_symbol_constructor_specializations): Remove.
	* etc/bench.pl.in: Adjust to this new API.