RFR (xs) 8037138: x86: problem with JVMTI breakpoint

[Coleen Phillimore]

Summary: do aload(0) after rewriting aload bytecodes to fast version for 
frequent pairs.

This is more of a cleanup since RewriteFrequentPairs is turned off for 
breakpoint debugging, because if frequent pairs of bytecodes are 
rewritten, you can't set a breakpoint on the second bci of a pair 
because it's not executed with this optimization.

Now all the platforms are the same as ppc for this.

Tested with jprt since aload(0) in the interpreter is executed a many times.

open webrev at http://cr.openjdk.java.net/~coleenp/8037138.01/webrev
bug link https://bugs.openjdk.java.net/browse/JDK-8037138


See bug for how this came up on the openjdk thread.

Thanks,
Coleen