Move assert.h/assert.cc from runtime/vm to runtime/platform

runtime/bin/builtin.h

Index: runtime/bin/builtin.h
diff --git a/runtime/bin/builtin.h b/runtime/bin/builtin.h
index b145e6350d8697eec951df76c284fae90cf1a35d..32a713bffc1d357958d54f55498809045a94952d 100644
--- a/runtime/bin/builtin.h
+++ b/runtime/bin/builtin.h
@@ -9,25 +9,9 @@
 #include <stdlib.h>
 
 #include "include/dart_api.h"
+#include "platform/assert.h"
 #include "platform/globals.h"
 
-#ifdef DEBUG
-#define ASSERT(expr) assert(expr)
-#else
-#define ASSERT(expr) USE(expr)
-#endif
-
-#define FATAL(error)                                                           \
-  fprintf(stderr, "%s\n", error);                                              \
-  fflush(stderr);                                                              \
-  abort();
-
-#define UNREACHABLE()                                                          \
-  FATAL("unreachable code")
-
-#define UNIMPLEMENTED()                                                        \
-  FATAL("unimplemented code")
-
 #define FUNCTION_NAME(name) Builtin_##name
 #define REGISTER_FUNCTION(name, count)                                         \
   { ""#name, FUNCTION_NAME(name), count },