dart2js: Move lowering of identical(a, b) from builder to optimizer

sdk/lib/_internal/js_runtime/lib/core_patch.dart

Index: sdk/lib/_internal/js_runtime/lib/core_patch.dart
diff --git a/sdk/lib/_internal/js_runtime/lib/core_patch.dart b/sdk/lib/_internal/js_runtime/lib/core_patch.dart
index ba537fd8c7cefa90da31d63b2d064a4a09e66d0d..af96764c5665553988c70778e3e1b16191570c6b 100644
--- a/sdk/lib/_internal/js_runtime/lib/core_patch.dart
+++ b/sdk/lib/_internal/js_runtime/lib/core_patch.dart
@@ -500,6 +500,7 @@ class RegExp {
 }
 
 // Patch for 'identical' function.
+@NoInline() // No inlining since we recognize the call in optimizer.
 @patch
 bool identical(Object a, Object b) {
   return JS('bool', '(# == null ? # == null : # === #)', a, b, a, b);