RFR(XS): 8218544: Fix build on windows: missing include

[Aleksey Shipilev]

On 2/6/19 12:54 PM, David Holmes wrote:
> 8218041  was tested with and without PCH and we do not see any failures in our builds.

Same.

> Very perplexing.

Same.

> But reviewed.

Same.

-Aleksey