RFR (S) 8217423: Windows gtest build fails after JDK-8212826 (Make PtrQueue free list lock-free)

[Aleksey Shipilev]

Bug:
  https://bugs.openjdk.java.net/browse/JDK-8217423

Fix:
  http://cr.openjdk.java.net/~shade/8217423/webrev.01/

Current Windows build is broken. This patch fixes it by renaming the test typedef to resolve the
name conflict with the actual Stack. I suspect that definition comes via precompiled.hpp, but
regardless, including stack.hpp accidentally should not break the test. Let's instead use the
special name for test typedef.

Testing: {Linux, Windows} x86_64 build, gtest; jdk-submit (running)

Thanks,
-Aleksey

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