Revert "[Fasta] Do not emit default arguments at callsite"

pkg/front_end/lib/src/fasta/kernel/body_builder.dart

Index: pkg/front_end/lib/src/fasta/kernel/body_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart b/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
index 21e00f59580a008ed96a87404c6527c78fbffda0..d9156ba62a4e80570c76c460d085c0c8c5a2d14d 100644
--- a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
@@ -1622,7 +1622,7 @@ class BodyBuilder extends ScopeListener<JumpTarget> implements BuilderHelper {
     if (target is Constructor) {
       typeParameters = target.enclosingClass.typeParameters;
     }
-    if (!checkArguments(target.function, arguments, typeParameters)) {
+    if (!addDefaultArguments(target.function, arguments, typeParameters)) {
       return throwNoSuchMethodError(target.name.name, arguments, charOffset);
     }
     if (target is Constructor) {
@@ -1632,13 +1632,31 @@ class BodyBuilder extends ScopeListener<JumpTarget> implements BuilderHelper {
     }
   }
 
-  bool checkArguments(FunctionNode function, Arguments arguments,
+  bool addDefaultArguments(FunctionNode function, Arguments arguments,
       List<TypeParameter> typeParameters) {
+    bool missingInitializers = false;
+
+    Expression defaultArgumentFrom(Expression expression) {
+      if (expression == null) {
+        missingInitializers = true;
+        return null;
+      }
+      cloner ??= new CloneVisitor();
+      return cloner.clone(expression);
+    }
 
     if (arguments.positional.length < function.requiredParameterCount ||
         arguments.positional.length > function.positionalParameters.length) {
       return false;
     }
+    for (int i = arguments.positional.length;
+        i < function.positionalParameters.length;
+        i++) {
+      var expression =
+          defaultArgumentFrom(function.positionalParameters[i].initializer);
+      expression?.parent = arguments;
+      arguments.positional.add(expression);
+    }
     Map<String, VariableDeclaration> names;
     if (function.namedParameters.isNotEmpty) {
       names = <String, VariableDeclaration>{};
@@ -1655,6 +1673,14 @@ class BodyBuilder extends ScopeListener<JumpTarget> implements BuilderHelper {
         }
       }
     }
+    if (names != null) {
+      for (String name in names.keys) {
+        VariableDeclaration parameter = names[name];
+        arguments.named.add(new NamedExpression(
+            name, defaultArgumentFrom(parameter.initializer))
+          ..parent = arguments);
+      }
+    }
     if (typeParameters.length != arguments.types.length) {
       arguments.types.clear();
       for (int i = 0; i < typeParameters.length; i++) {
@@ -1662,6 +1688,9 @@ class BodyBuilder extends ScopeListener<JumpTarget> implements BuilderHelper {
       }
     }
 
+    if (missingInitializers) {
+      library.addArgumentsWithMissingDefaultValues(arguments, function);
+    }
     return true;
   }