Make TestJSArrayForAllocationMemento less awkward.

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index 33af5358b79835da1a04130e29d1f8fc1ea42d1e..a6d782e44d92b52c9a985493d6ecbde03331311b 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -957,9 +957,20 @@ class MacroAssembler: public Assembler {
   // to another type.
   // On entry, receiver_reg should point to the array object.
   // scratch_reg gets clobbered.
-  // If allocation info is present, conditional code is set to equal
+  // If allocation info is present, conditional code is set to equal.
   void TestJSArrayForAllocationMemento(Register receiver_reg,
-                                       Register scratch_reg);
+                                       Register scratch_reg,
+                                       Label* no_memento_found);
+
+  void JumpIfJSArrayHasAllocationMemento(Register receiver_reg,
+                                         Register scratch_reg,
+                                         Label* memento_found) {
+    Label no_memento_found;
+    TestJSArrayForAllocationMemento(receiver_reg, scratch_reg,
+                                    &no_memento_found);
+    j(equal, memento_found);
+    bind(&no_memento_found);
+  }
 
  private:
   bool generating_stub_;