[TESTBUG] runtime/ErrorHandling tests are building incorrect testlibrary classes

jdk8u-dev/hotspot/test $ jtreg -jdk:/home/shade/trunks/jdk8u-dev/build/linux-x86_64-normal-server-fastdebug/images/j2sdk-image/ -conc:8 runtime/ErrorHandling/*

command: build jdk.test.lib.*
reason: User specified action: run build jdk.test.lib.*
result: Not run. Test running...
test result: Error. can't find jdk.test.lib.* in test directory or libraries


This is caused by bad backport to 8u here:
 http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/rev/8641949eb21f

It builds jdk.test.lib.*, but uses com.sun.oracle.java.testlibrary.*:

+ * @build jdk.test.lib.*
...
+import com.oracle.java.testlibrary.ProcessTools;
+import com.oracle.java.testlibrary.OutputAnalyzer;

The 9 version is fine:
  http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/cbc2d5fbdae1