RFR (XS) 8043274: Test compiler/7184394/TestAESMain.java gets NPE on solaris

[Vladimir Kozlov]

https://bugs.openjdk.java.net/browse/JDK-8043274
http://cr.openjdk.java.net/~kvn/8043274/webrev/

Contributed by Shrinivas:

"Current code destroys value in L0 before registers are saved.
I tested this change with and without compressed oops using the test 
case that was initially contributed as part of JDK-7184394. I tested all 
key sizes, with few different input sizes and both aligned and 
mis-aligned cases. JTREG jdk tests in com/sun/crypto/provider/ did not 
show any new failures. JPRT run was also successful."

The fix looks good and I will push it.

Thanks,
Vladimir