diff --git a/pkg/front_end/testcases/nnbd/ffi_struct_inline_array.dart.strong.expect b/pkg/front_end/testcases/nnbd/ffi_struct_inline_array.dart.strong.expect
index 910440d..fa7c510 100644
--- a/pkg/front_end/testcases/nnbd/ffi_struct_inline_array.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/ffi_struct_inline_array.dart.strong.expect
@@ -24,4 +24,4 @@
 
 Constructor coverage from constants:
 org-dartlang-testcase:///ffi_struct_inline_array.dart:
-- _ArraySize. (from org-dartlang-sdk:///sdk/lib/ffi/ffi.dart:107:9)
+- _ArraySize. (from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/ffi_patch.dart:133:9)
diff --git a/pkg/front_end/testcases/nnbd/ffi_struct_inline_array.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/ffi_struct_inline_array.dart.strong.transformed.expect
index 494a391..77d29d6 100644
--- a/pkg/front_end/testcases/nnbd/ffi_struct_inline_array.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/ffi_struct_inline_array.dart.strong.transformed.expect
@@ -50,4 +50,4 @@
 
 Constructor coverage from constants:
 org-dartlang-testcase:///ffi_struct_inline_array.dart:
-- _ArraySize. (from org-dartlang-sdk:///sdk/lib/ffi/ffi.dart:107:9)
+- _ArraySize. (from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/ffi_patch.dart:133:9)
diff --git a/pkg/front_end/testcases/nnbd/ffi_struct_inline_array.dart.weak.expect b/pkg/front_end/testcases/nnbd/ffi_struct_inline_array.dart.weak.expect
index e502c15..5125b89 100644
--- a/pkg/front_end/testcases/nnbd/ffi_struct_inline_array.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/ffi_struct_inline_array.dart.weak.expect
@@ -24,4 +24,4 @@
 
 Constructor coverage from constants:
 org-dartlang-testcase:///ffi_struct_inline_array.dart:
-- _ArraySize. (from org-dartlang-sdk:///sdk/lib/ffi/ffi.dart:107:9)
+- _ArraySize. (from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/ffi_patch.dart:133:9)
diff --git a/pkg/front_end/testcases/nnbd/ffi_struct_inline_array.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/ffi_struct_inline_array.dart.weak.transformed.expect
index c9607e0..bd41225 100644
--- a/pkg/front_end/testcases/nnbd/ffi_struct_inline_array.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/ffi_struct_inline_array.dart.weak.transformed.expect
@@ -50,4 +50,4 @@
 
 Constructor coverage from constants:
 org-dartlang-testcase:///ffi_struct_inline_array.dart:
-- _ArraySize. (from org-dartlang-sdk:///sdk/lib/ffi/ffi.dart:107:9)
+- _ArraySize. (from org-dartlang-sdk:///sdk/lib/_internal/vm/lib/ffi_patch.dart:133:9)
diff --git a/runtime/vm/compiler/frontend/kernel_binary_flowgraph.cc b/runtime/vm/compiler/frontend/kernel_binary_flowgraph.cc
index 1bb096e..e3708c8 100644
--- a/runtime/vm/compiler/frontend/kernel_binary_flowgraph.cc
+++ b/runtime/vm/compiler/frontend/kernel_binary_flowgraph.cc
@@ -229,7 +229,8 @@
 
     bool has_field_initializers = false;
     for (intptr_t i = 0; i < list_length; ++i) {
-      if (PeekTag() == kRedirectingInitializer) {
+      if (PeekTag() == kRedirectingInitializer ||
+          PeekTag() == kRedirectingFactoryConstructor) {
         is_redirecting_constructor = true;
       } else if (PeekTag() == kFieldInitializer) {
         has_field_initializers = true;
diff --git a/runtime/vm/compiler/frontend/kernel_translation_helper.cc b/runtime/vm/compiler/frontend/kernel_translation_helper.cc
index 06aeae2..1da5a95 100644
--- a/runtime/vm/compiler/frontend/kernel_translation_helper.cc
+++ b/runtime/vm/compiler/frontend/kernel_translation_helper.cc
@@ -433,15 +433,18 @@
 }
 
 const String& TranslationHelper::DartProcedureName(NameIndex procedure) {
-  ASSERT(IsProcedure(procedure));
+  ASSERT(IsProcedure(procedure) || IsConstructor(procedure));
   if (IsSetter(procedure)) {
     return DartSetterName(procedure);
   } else if (IsGetter(procedure)) {
     return DartGetterName(procedure);
   } else if (IsFactory(procedure)) {
     return DartFactoryName(procedure);
-  } else {
+  } else if (IsMethod(procedure)) {
     return DartMethodName(procedure);
+  } else {
+    ASSERT(IsConstructor(procedure));
+    return DartConstructorName(procedure);
   }
 }
 
diff --git a/sdk/lib/_internal/vm/lib/ffi_patch.dart b/sdk/lib/_internal/vm/lib/ffi_patch.dart
index ed93ed2..38dbcda 100644
--- a/sdk/lib/_internal/vm/lib/ffi_patch.dart
+++ b/sdk/lib/_internal/vm/lib/ffi_patch.dart
@@ -122,6 +122,15 @@
       throw RangeError.range(index, 0, _size);
     }
   }
+
+  @patch
+  const factory Array(int dimension1) = _ArraySize<T>;
+}
+
+class _ArraySize<T extends NativeType> implements Array<T> {
+  final int dimension1;
+
+  const _ArraySize(this.dimension1);
 }
 
 /// Returns an integer encoding the ABI used for size and alignment
diff --git a/sdk/lib/ffi/ffi.dart b/sdk/lib/ffi/ffi.dart
index e747811..8510065 100644
--- a/sdk/lib/ffi/ffi.dart
+++ b/sdk/lib/ffi/ffi.dart
@@ -97,14 +97,7 @@
   /// ```
   ///
   /// Do not invoke in normal code.
-  const factory Array(int dimension1) = _ArraySize<T>;
-}
-
-// TODO(http://dartbug.com/45101): Move to ffi_patch.dart.
-class _ArraySize<T extends NativeType> implements Array<T> {
-  final int dimension1;
-
-  const _ArraySize(this.dimension1);
+  external const factory Array(int dimension1);
 }
 
 /// Extension on [Pointer] specialized for the type argument [NativeFunction].