RFR(XS): 8078048: Fix non-pch build after "8076457: Fix includes of inline.hpp in GC code"

[Lindenmaier, Goetz]

Hi,

This change fixes the build without precompiled headers.

Please review this change.  I please need a sponsor.
http://cr.openjdk.java.net/~goetz/webrevs/8078048-pchBuild/webrev.01/

Best regards,
  Goetz.
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