RFR (XXXS): 8145752: Fix include guards in GC code

[Thomas Schatzl]

Hi all,

  can I have reviews for this change that fixes include guards in GC
code?

In the review for 8145667 StefanK noticed that some include guards are

#endif  /* SHARE_VM_GC_G1_G1FROMCARDCACHE_HPP */

while they should be

#endif // SHARE_VM_GC_G1_HEAPREGIONREMSET_HPP

CR:
https://bugs.openjdk.java.net/browse/JDK-8145752
Webrev:
http://cr.openjdk.java.net/~tschatzl/8145752/webrev/
Testing:
local compilation

Thanks,
  Thomas