RFR: 8213440: Lingering INCLUDE_ALL_GCS in test_oopStorage_parperf.cpp

[Kim Barrett]

Please review this trivial change to remove no longer needed and now
incorrect conditionalizing out of a gtest.

CR:
https://bugs.openjdk.java.net/browse/JDK-8213440

Webrev:
http://cr.openjdk.java.net/~kbarrett/8213440/open.00/

Testing:
mach5 tier1 (which runs the test in question, along with other gtests).
Local build with only SerialGC (see JDK-8213503) and verified this test
succeeds in that configuration.