Subzero: Temporary fix for build error.

The compile error was introduced in https://codereview.chromium.org/361733002/ .

BUG= none
R=wala@chromium.org

Review URL: https://codereview.chromium.org/376923003
diff --git a/src/IceTranslator.h b/src/IceTranslator.h
index 0450f09..648faea 100644
--- a/src/IceTranslator.h
+++ b/src/IceTranslator.h
@@ -40,7 +40,7 @@
   ClFlags &Flags;
   // The exit status of the translation. 0 is successful. Nonzero
   // otherwise.
-  bool ExitStatus;
+  int ExitStatus;
   // Ideally, Func would be inside the methods that converts IR to
   // functions.  However, emitting the constant pool requires a valid
   // Cfg object, so we need to defer deleting the last non-empty Cfg