RFR (backport): 8032586 Fix typos in the GC code (and runtime and compiler as it turned out)

[Jesper Wilhelmsson]

Hi,

The typos patch from jdk9/hs-gc applied cleanly on jdk8u/hs-dev so kindly 
approve this for backport to jdk8.

The bugs:
jdk9: https://bugs.openjdk.java.net/browse/JDK-8032586
jdk8: https://bugs.openjdk.java.net/browse/JDK-8025856

Reviews in these threads:
http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2014-January/009080.html
http://mail.openjdk.java.net/pipermail/hotspot-dev/2014-January/012154.html

The jdk9 changeset:
http://hg.openjdk.java.net/jdk9/hs-gc/hotspot/rev/63a4eb8bcd23

Thanks,
/Jesper