Drop trailing `dynamic` when dumping inferred types.

pkg/analyzer/tool/summary/dump_inferred_types.dart

Index: pkg/analyzer/tool/summary/dump_inferred_types.dart
diff --git a/pkg/analyzer/tool/summary/dump_inferred_types.dart b/pkg/analyzer/tool/summary/dump_inferred_types.dart
index 4c086e0c89813dfd83d1a87085e9429564ec2f76..bb7073416bdfd9a13f67798952aa0385e93f4bb0 100644
--- a/pkg/analyzer/tool/summary/dump_inferred_types.dart
+++ b/pkg/analyzer/tool/summary/dump_inferred_types.dart
@@ -178,8 +178,12 @@ class InferredTypeCollector {
           typeParamsInScope.length - entityRef.paramReference];
     }
     String result = formatReference(entityRef.reference, typeOf: true);
-    if (entityRef.typeArguments.isNotEmpty) {
-      result += '<${entityRef.typeArguments.map(formatType).join(', ')}>';
+    List<EntityRef> typeArguments = entityRef.typeArguments.toList();
+    while (typeArguments.isNotEmpty && isDynamic(typeArguments.last)) {
+      typeArguments.removeLast();
+    }
+    if (typeArguments.isNotEmpty) {
+      result += '<${typeArguments.map(formatType).join(', ')}>';
     }
     if (implicitFunctionTypeIndices.isNotEmpty) {
       result =
@@ -189,6 +193,17 @@ class InferredTypeCollector {
   }
 
   /**
+   * Determine if the given [entityRef] represents the pseudo-type `dynamic`.
+   */
+  bool isDynamic(EntityRef entityRef) {
+    if (entityRef.syntheticReturnType != null ||
+        entityRef.paramReference != 0) {
+      return false;
+    }
+    return formatReference(entityRef.reference, typeOf: true) == 'dynamic';
+  }
+
+  /**
    * Collect all the inferred types contained in [obj], which is reachable via
    * [path].  [properties] is the result of calling `obj.toMap()`, and may be
    * modified before returning.