RFR (XS): [8u20] 8035406: Improve data structure for Code Cache remembered sets

[Thomas Schatzl]

Hi all,

  could I have reviews for the following minor merge conflict when
backporting 8035406: Improve data structure for Code Cache remembered
sets to 8u20?

The issue is that the following hunks in prims/jni.cpp failed:

--- src/share/vm/prims/jni.cpp
+++ src/share/vm/prims/jni.cpp
@@ -3882,6 +3882,7 @@
 void TestOldFreeSpaceCalculation_test();
 void TestG1BiasedArray_test();
 void TestBufferingOopClosure_test();
+void TestCodeCacheRemSet_test();
 #endif
 
 void execute_internal_vm_tests() {
@@ -3910,6 +3911,7 @@
     run_unit_test(TestG1BiasedArray_test());
     run_unit_test(HeapRegionRemSet::test_prt());
     run_unit_test(TestBufferingOopClosure_test());
+    run_unit_test(TestCodeCacheRemSet_test());
 #endif
     tty->print_cr("All internal VM tests passed");
   }

The problem is that "8033764: Remove the usage of StarTask from
BufferingOopClosure" has not been applied to the 8u20 branch, i.e. the 
"TestBufferingOopClosure_test" and "TestBufferingOopClosure_test" lines
are not in the 8u branch, causing the mentioned conflict.

This backport will remove the conflicts when applying of Per's string
dedup patch. (Thread starting at
http://mail.openjdk.java.net/pipermail/hotspot-dev/2014-March/013178.html )

CR:
https://bugs.openjdk.java.net/browse/JDK-8035406

New webrev:
http://cr.openjdk.java.net/~tschatzl/8035406/8u20/webrev/

Original webrev:
http://cr.openjdk.java.net/~tschatzl/8035406/webrev/

Testing:
jprt

Thanks,
  Thomas