Patch print directly in corelib instead of going through coreimpl.

lib/compiler/implementation/lib/core_patch.dart

Index: lib/compiler/implementation/lib/core_patch.dart
diff --git a/lib/compiler/implementation/lib/core_patch.dart b/lib/compiler/implementation/lib/core_patch.dart
index 4e22ea13ab51d931a8a572ffcbaa52b8af3d9d9f..5aa14c12e83825c75bb691f0e802f53041876aaf 100644
--- a/lib/compiler/implementation/lib/core_patch.dart
+++ b/lib/compiler/implementation/lib/core_patch.dart
@@ -4,6 +4,16 @@
 
 // Patch file for dart:core classes.
 
+// Patch for 'print' function.
+patch void print(var obj) {
+  if (obj is String) {
+    Primitives.printString(obj);
+  } else {
+    Primitives.printString(obj.toString());
+  }
+}
+
+
 // Patch for Object implementation.
 patch class Object {
   patch String toString() {