Fix for a possible bug in RegExp stack guard.

src/ia32/regexp-macro-assembler-ia32.cc

Index: src/ia32/regexp-macro-assembler-ia32.cc
diff --git a/src/ia32/regexp-macro-assembler-ia32.cc b/src/ia32/regexp-macro-assembler-ia32.cc
index 7d7de0ef44fb7d61b87080ae968aee9fdbbcaa3e..d175d9e03667514f9ebda73216c12262a3404ea2 100644
--- a/src/ia32/regexp-macro-assembler-ia32.cc
+++ b/src/ia32/regexp-macro-assembler-ia32.cc
@@ -1080,7 +1080,7 @@ int RegExpMacroAssemblerIA32::CheckStackGuardState(Address* return_address,
   MaybeObject* result = Execution::HandleStackGuardInterrupt();
 
   if (*code_handle != re_code) {  // Return address no longer valid
-    int delta = *code_handle - re_code;
+    int delta = code_handle->address() - re_code->address();
     // Overwrite the return address on the stack.
     *return_address += delta;
   }