Provide a message with invalid HostObjects

Re-using an already-present error message:
MSB3087: An incompatible host object was passed into the "{0}" task.  The host object for this task must implement the "{1}" interface.

src/Compilers/Core/MSBuildTask/Csc.cs

@@ -208,7 +208,7 @@ protected internal override void AddResponseFileCommands(CommandLineBuilderExten
             }
             else if (HostObject != null)
             {
-                throw new InvalidOperationException();
+                throw new InvalidOperationException(string.Format(ErrorString.General_IncorrectHostObject, "Csc", "ICscHostObject"));
             }
             if (!designTime)
             {

src/Compilers/Core/MSBuildTask/Vbc.cs

@@ -512,7 +512,7 @@ protected internal override void AddResponseFileCommands(CommandLineBuilderExten
             }
             else if (this.HostObject != null)
             {
-                throw new InvalidOperationException();
+                throw new InvalidOperationException(string.Format(ErrorString.General_IncorrectHostObject, "Vbc", "IVbcHostObject"));
             }
             if (!designTime)
             {