Fix some clang warnings with -Wmissing-braces in v8.

src/base/sys-info.cc

Index: src/base/sys-info.cc
diff --git a/src/base/sys-info.cc b/src/base/sys-info.cc
index 617a88ea818c969865082d779be86fcbbef06153..a2dc6ab27fc7e8f649dfd2dcc005092ee404de09 100644
--- a/src/base/sys-info.cc
+++ b/src/base/sys-info.cc
@@ -44,7 +44,7 @@ int SysInfo::NumberOfProcessors() {
   }
   return static_cast<int>(result);
 #elif V8_OS_WIN
-  SYSTEM_INFO system_info = {0};
+  SYSTEM_INFO system_info = {};
   ::GetNativeSystemInfo(&system_info);
   return static_cast<int>(system_info.dwNumberOfProcessors);
 #endif