RFR(XXS): 8166765: [ppc] Port "8163014: Mysterious/wrong value for long frame local variable on 64-bit"

[Lindenmaier, Goetz]

Hi,

could I please get reviews for this tiny fix?
http://cr.openjdk.java.net/~goetz/wr16/8166765-long_stack_vl/webrev/

Will 8163014 get downported to 8?

In future, I would be happy if I/SAP/the ppc community were pinged 
more vigorously to supply the ppc code for a fix like this.  Especially if
it will be downported this would simplify manners a lot.
We're always happy to help out with code snippets like this!

Best regards,
  Goetz.