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The flag suppressed user defined warning from libc++
https://github.com/llvm-project/llvm-project-20170507/blob/a2e822e3ac432da65d730dca1f2cbeee49f6e235/libcxx/include/__tree#L1848

I think this will be useful to prevent forgotten const.

Bug: 683349
Change-Id: I24199ae9bf065ee6560b6caa397cd5fd8c042e83
Reviewed-on: https://chromium-review.googlesource.com/c/1286103
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601055}