Review request (S): 6663621:JVM crashes while trying to execute api/java_security/Signature/SignatureTests.html#initSign tests

[Chuck Rasbold]

http://webrev.invokedynamic.info/rasbold/6663621/index.html

Fixed 6663621:JVM crashes while trying to execute 
api/java_security/Signature/SignatureTests.html#initSign tests.

Generated code crashes in certain kinds of vectorized loops in the 64
bit VM.

Mis-alignment of vector arguments is the root cause of the crash.
Deeper issues involving the alignment code need to be investigated;
this expedient fix simply turns off SuperWord transformations in 64
bit VMs.  They can be turned back on with with +AggressiveOpts.

Reviewed by:

Fix verified (y/n): y