Fixes crash when SRE code calls a vararg method.

Fixes crash when SRE code calls a vararg method.

2010-07-29 Rodrigo Kumpera  <rkumpera@novell.com>

	Add support for calling vararg methods from SRE code.
	This requires storing per-memberref signatures so
	the JIT can know how many varargs parameters are
	been passed.

	* loader.c (mono_method_get_signature_full): If the
	image is dynamic call mono_reflection_lookup_signature
	to lookup the signature.

	* reflection.c (mono_image_create_method_token): Save
	the method object into the MonoDynamicImage::tokens.
	Create a signature struct for MethodBuilders.
	Save the signature into vararg_aux_hash so it can be
	retrieved later.

	* reflection.c (mono_reflection_lookup_signature): New
	function. Check vararg_aux_hash for a signature before
	returning method's own signature.

	* metadata-internals.h (MonoDynamicImage): Add new
	vararg_aux_hash hashtable.

	* object-internals.h: Add mono_reflection_lookup_signature.

	Fixes #626441