RFR (XXS): 8u40 backport of 8055816: Remove dead code in g1BlockOffsetTable

[Thomas Schatzl]

Hi all,

  can I have reviews for this small backport of 8055816 to 8u40 that
helps applying 8059756: Footprint regressions with JDK-8038423, i.e.
making it apply cleanly.

There is a merge error due to a typo fix already applied to jdk-9.

The difference in the source trees that caused the merge error is in
g1BlockOffsetTable.cpp, line 415 where there is a typo ("themsleves")
that had already been fixed in jdk9.

Note that the patch removes the entire method that contained that merge
error.

Original CR:
https://bugs.openjdk.java.net/browse/JDK-8055816
Webrev:
http://cr.openjdk.java.net/~tschatzl/8055816/webrev.8u40/
Testing:
jprt


Thanks,
  Thomas