PR 10861

	* script.h (class Version_script_info): Define Language enum.
	Update declarations.  Define Glob, Exact, and Lookup types.  Add
	new fields globals_, locals_, and is_finalized_.
	* script.cc: Various formatting fixes.
	(class Parser_closure): Change language_stack_ from a vector of
	std::string to one of Version_script_info::Language.  Adjust all
	uses accordingly.
	(class Lazy_demangler): Remove.
	(struct Version_expression): Change language from std::string to
	Version_script_info::Language.
	(Version_script_info::Version_script_info): New function.
	(Version_script_info::~Version_script_info): Don't call clear.
	(Version_script_info::finalize): New function.
	(Version_script_info::build_lookup_tables): New function.
	(Version_script_info::build_expression_list_lookup): New
	function.
	(Version_script_info::get_symbol_version_helper): Rewrite to use
	lookup tables.
	(Version_script_info::print_expression_list): Adjust to use
	Version_script_info::Language.
	(script_push_lex_into_version_mode): Check that the version script
	has not been finalized.
	(version_script_push_lang): Change language string to
	Version_script_info::Language.
	* options.cc (Command_line::version_script): New function.
	* options.h (class General_options): Add finalize_dynamic_list
	function.  Change version_script from declaration to definition.
	* testsuite/ver_test_4.script: Remove duplicate def of t2_2.
	* testsuite/version_script.map: Remove duplicate def of foo.
	* testsuite/Makefile.am (ver_matching_def.so): Depend upon
	version_script.map.
	* testsuite/Makefile.in: Rebuild.