Fix arm simulator build on Max OS X. For some reason the GCC version...

src/arm/virtual-frame-arm.h

Index: src/arm/virtual-frame-arm.h
===================================================================
--- src/arm/virtual-frame-arm.h	(revision 4440)
+++ src/arm/virtual-frame-arm.h	(working copy)
@@ -376,8 +376,15 @@
   static const int kPreallocatedElements = 5 + 8;  // 8 expression stack slots.
 
   // 5 states for the top of stack, which can be in memory or in r0 and r1.
-  enum TopOfStack { NO_TOS_REGISTERS, R0_TOS, R1_TOS, R1_R0_TOS, R0_R1_TOS,
-                    TOS_STATES};
+  enum TopOfStack { 
+    NO_TOS_REGISTERS, 
+    R0_TOS,
+    R1_TOS,
+    R1_R0_TOS,
+    R0_R1_TOS,
+    TOS_STATES
+  };
+
   static const int kMaxTOSRegisters = 2;
 
   static const bool kR0InUse[TOS_STATES];