[C++] syntax highlighting is not correct

[milesxu]

When I use vscode to browse the db_bench.cc in the source code of rocksdb, I found the syntax highlighting of C++ is incorrect. Illustrated below:
screenshot of syntax highlighting in vscode,

whereas, the same content displayed in atom

The colors used in atom editor is much richer, and it will not misinterpret keywords in strings such as if or for.
Environment:
ArchLinux 4.4.5 64bit
vscode 0.10.10
atom 1.5.3

[aeschli]

duplicate of #4769