RFR (XS) 8221918: runtime/SharedArchiveFile/serviceability/ReplaceCriticalClasses.java fails: Shared archive not found

[Aleksey Shipilev]

Test bug:
  https://bugs.openjdk.java.net/browse/JDK-8221918

Fix:
  http://cr.openjdk.java.net/~shade/8221918/webrev.01/

It seems the test is running with -Xshare:auto, which expects the CDS archive to be generated by
default during the build? x86_32 fails with "Shared archive not found" in that test, and it fails
tier1 then.

Dumping the CDS archive before starting the test helps those configs where archive is not created
automatically. I copy-pasted the new block from the test (later in the same file) and dropped some
non-essentials.

Testing: affected test on Linux {x86_64, x86_32} fastdebug, jdk-submit (running)

-- 
Thanks,
-Aleksey