RFR (XS) 8220198: Lots of com/sun/crypto/provider/Cipher tests fail on x86_32 due to missing SHA512 stubs

[Aleksey Shipilev]

Bug:
  https://bugs.openjdk.java.net/browse/JDK-8220198

Fix:
  http://cr.openjdk.java.net/~shade/8220198/webrev.01/

Actually, we might consider enabling these stubs for 32-bit builds, but it would require more work.
I want to get this easy patch in to make it cleanly backportable to 12u and 11u, where x86_32 is
broken too. Not very sure about the assert in GraphKit: it turns the cryptic crash into proper
failure, and I _think_ there are no false negatives from it, because calling to NULL stub would
crash eventually anyway.

Testing: Linux {x86_64, x86_32} tier1, Cipher tests are fixed on 32-bit, jdk-submit (running)

Thanks,
-Aleksey


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