Make the specialized types created for bind/goog.partial anonymous

These types are unique from the original definitions, so they should rightly
be a new anonymous type rather than conflated with the original type.

PiperOrigin-RevId: 326034992

Author: blickly

src/com/google/javascript/jscomp/TypeInference.java

@@ -1974,6 +1974,7 @@ private void updateBind(Node n) {
             FunctionType.builder(registry)
                 .copyFromOtherFunction(callTargetFn)
                 .withTypeOfThis(thisType.toObjectType())
+                .withSourceNode(null)
                 .buildAndResolve();
         target.setJSType(callTargetFn);
       }
@@ -1990,6 +1991,7 @@ private void updateBind(Node n) {
           FunctionType.builder(registry)
               .copyFromOtherFunction(bindType)
               .withReturnType(returnType)
+              .withSourceNode(null)
               .buildAndResolve();
       n.getFirstChild().setJSType(bindType);
     }
@@ -2715,4 +2717,3 @@ private static TypedVar getDeclaredVar(FlowScope scope, String name) {
     return ((TypedScope) scope.getDeclarationScope()).getVar(name);
   }
 }
-