Make RUNTIME_ASSERT have more useful output in debug mode

src/base/logging.h

Index: src/base/logging.h
diff --git a/src/base/logging.h b/src/base/logging.h
index e4e3f49bfaffa645d575a000e396ca5fd586e871..15322f6126dcb9efbf31216effd5e2871b79346c 100644
--- a/src/base/logging.h
+++ b/src/base/logging.h
@@ -14,6 +14,8 @@
 extern "C" V8_NORETURN void V8_Fatal(const char* file, int line,
                                      const char* format, ...);
 
+extern "C" void V8_RuntimeError(const char* file, int line,
+                                const char* message);
 
 // The FATAL, UNREACHABLE and UNIMPLEMENTED macros are useful during
 // development, but they should not be relied on in the final product.