Handle constrained. with dynamic methods.

Handle constrained. with dynamic methods.

	* loader.c (mono_get_method_constrained): Move the constrained
	type resolution to get_method_constrained.

	* loader.c: Add mono_get_method_constrained_with_method that
	passes the unconstrained method instead of its token.

	* method-to-ir.c (mono_method_to_ir): Use new function
	to resolve constrained methods for dynamic methods.

	Fixes #685908