NH-3807 - Guard CodeDom and handle switch between DelegateBuilder creation calls.

Author: ngbrown

src/NHibernate/Bytecode/CodeDom/BytecodeProviderImpl.cs

@@ -1,3 +1,5 @@
+#if FEATURE_CODEDOM
+
 using System;
 using System.CodeDom.Compiler;
 using System.Reflection;
@@ -262,3 +264,5 @@ private string GenerateCode()
 		#endregion
 	}
 }
+
+#endif

src/NHibernate/Bytecode/EmitUtil.cs

@@ -179,7 +179,11 @@ public static System.Type DefineDelegateType(
 			methodBuilder.SetImplementationFlags(
 				MethodImplAttributes.Runtime | MethodImplAttributes.Managed);
 
+#if FEATURE_LEGACY_REFLECTION_API
 			return delegateBuilder.CreateType();
+#else
+			return delegateBuilder.CreateTypeInfo().AsType();
+#endif
 		}
 
 		public static void EmitLoadType(ILGenerator il, System.Type type)

src/NHibernate/Cfg/Environment.cs

@@ -348,8 +348,10 @@ private static IBytecodeProvider BuildBytecodeProvider(string providerName)
 		{
 			switch (providerName)
 			{
+#if FEATURE_CODEDOM
 				case "codedom":
 					return new Bytecode.CodeDom.BytecodeProviderImpl();
+#endif
 				case "lcg":
 					return new Bytecode.Lightweight.BytecodeProviderImpl();
 				case "null":