PR modula2/115823 Wrong expansion of isnormal optab

PR modula2/115823 Wrong expansion of isnormal optab

The bug fix changes gcc/m2/gm2-gcc/m2builtins.c:m2builtins_BuiltinExists
to recognise both __builtin_<functionname> and functionname as a builtin.

gcc/m2/ChangeLog:

	PR modula2/115823
	* gm2-gcc/m2builtins.cc (struct builtin_macro_definition): New
	field builtinname.
	(builtin_function_match): New function.
	(builtin_macro_match): Ditto.
	(m2builtins_BuiltinExists): Use builtin_function_match and
	builtin_macro_match.
	(lookup_builtin_macro): Use builtin_macro_match.
	(lookup_builtin_function): Use builtin_function_match.
	(define_builtin): Assign builtinname field.

gcc/testsuite/ChangeLog:

	PR modula2/115823
	* gm2/builtins/run/pass/testalloa.mod: New test.

Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>