Remove dependency from platform/globals.h to platform/assert.h

runtime/platform/globals.h

Index: runtime/platform/globals.h
diff --git a/runtime/platform/globals.h b/runtime/platform/globals.h
index 7f8beed655a92956d0f4ceda56c1468466173c5a..f866a7cff2e9ecfe6c5980f3df4168108a9485fc 100644
--- a/runtime/platform/globals.h
+++ b/runtime/platform/globals.h
@@ -40,13 +40,14 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>
+#include <cstdlib>
+#include <sstream>
 
 #if defined(_WIN32)
 #include "platform/c99_support_win.h"
 #include "platform/inttypes_support_win.h"
 #endif
 
-
 // Target OS detection.
 // for more information on predefined macros:
 //   - http://msdn.microsoft.com/en-us/library/b0084kay.aspx
@@ -192,10 +193,15 @@ private:                                                                       \
 
 
 // Macro to disallow allocation in the C++ heap. This should be used
-// in the private section for a class.
+// in the private section for a class. Don't use UNREACHABLE here to
+// avoid circular dependencies between platform/globals.h and
+// platform/assert.h.
 #define DISALLOW_ALLOCATION()                                                  \
 public:                                                                        \
-  void operator delete(void* pointer) { UNREACHABLE(); }                       \
+  void operator delete(void* pointer) {                                        \
+    fprintf(stderr, "unreachable code\n");                                     \
+    std::abort();                                                              \
+  }                                                                            \
 private:                                                                       \
   void* operator new(size_t size);