RFR: 8269120: Build failure with GCC 6.3.0 after JDK-8017163 [v2]

[Aleksey Shipilev]

> One of my CI servers that carry GCC 6.3.0 fails after JDK-8017163 with:
> 
> 
> In file included from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/gc/g1/g1CardSetFreeMemoryTask.hpp:29:0,
>                  from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/gc/g1/g1CollectedHeap.hpp:31,
>                  from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/gc/g1/g1CollectedHeap.inline.hpp:28,
>                  from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/gc/g1/heapRegion.inline.hpp:31,
>                  from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/gc/g1/g1AllocRegion.inline.hpp:30,
>                  from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/gc/g1/g1AllocRegion.cpp:26:

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Much simpler fix

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4551/files
  - new: https://git.openjdk.java.net/jdk/pull/4551/files/5ae1901c..85152606

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4551&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4551&range=00-01

  Stats: 15 lines in 3 files changed: 8 ins; 5 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4551.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4551/head:pull/4551

PR: https://git.openjdk.java.net/jdk/pull/4551