Fix mozilla regress-398085-01 failure on windows.

src/ia32/lithium-codegen-ia32.h

Index: src/ia32/lithium-codegen-ia32.h
diff --git a/src/ia32/lithium-codegen-ia32.h b/src/ia32/lithium-codegen-ia32.h
index 27295da8b80ddc8ac8d4373eaed02d17988d04ad..0beef85f0bcc347e9b8b766429429191fdcbf77a 100644
--- a/src/ia32/lithium-codegen-ia32.h
+++ b/src/ia32/lithium-codegen-ia32.h
@@ -408,6 +408,14 @@ class LCodeGen BASE_EMBEDDED {
   int X87ArrayIndex(X87Register reg);
   int x87_st2idx(int pos);
 
+#ifdef _MSC_VER
+  // On windows, you may not access the stack more than one page below
+  // the most recently mapped page. To make the allocated area randomly
+  // accessible, we write an arbitrary value to each page in range
+  // esp + offset - page_size .. esp in turn.
+  void MakeSureStackPagesMapped(int offset);
+#endif
+
   Zone* zone_;
   LPlatformChunk* const chunk_;
   MacroAssembler* const masm_;