fix #25740 again, making sure we have the substituted bound in inference

pkg/analyzer/lib/src/dart/element/member.dart

Index: pkg/analyzer/lib/src/dart/element/member.dart
diff --git a/pkg/analyzer/lib/src/dart/element/member.dart b/pkg/analyzer/lib/src/dart/element/member.dart
index 76ec36c2a0e31ff8cadeb6deeb2474bde6859297..4c95b28e2d80ca569c39633cdb9c2a106cf8cbc3 100644
--- a/pkg/analyzer/lib/src/dart/element/member.dart
+++ b/pkg/analyzer/lib/src/dart/element/member.dart
@@ -937,9 +937,13 @@ class TypeParameterMember extends Member implements TypeParameterElement {
   @override
   final DartType bound;
 
+  DartType _type;
+
   TypeParameterMember(
       TypeParameterElement baseElement, DartType definingType, this.bound)
-      : super(baseElement, definingType);
+      : super(baseElement, definingType) {
+    _type = new TypeParameterTypeImpl(this);
+  }
 
   @override
   TypeParameterElement get baseElement =>
@@ -949,11 +953,20 @@ class TypeParameterMember extends Member implements TypeParameterElement {
   Element get enclosingElement => baseElement.enclosingElement;
 
   @override
-  TypeParameterType get type => baseElement.type;
+  TypeParameterType get type => _type;
 
   @override
   accept(ElementVisitor visitor) => visitor.visitTypeParameterElement(this);
 
+  @override
+  int get hashCode => baseElement.hashCode;
+
+  @override
+  bool operator ==(obj) =>
+      // TODO(jmesserly): this equality should consider the bound, see:
+      // https://github.com/dart-lang/sdk/issues/27210
+      obj is TypeParameterMember && obj.baseElement == baseElement;
+
   /**
    * If the given [parameter]'s type is different when any type parameters from
    * the defining type's declaration are replaced with the actual type