RFR: 8210066: [JVMCI] iterateFrames uses wrong GrowableArray API for appending

[Doug Simon]

Requesting one more review for this small change please.

-Doug

> On 29 Aug 2018, at 21:49, dean.long at oracle.com wrote:
> 
> Looks good!
> 
> dl
> 
> On 8/29/18 8:06 AM, Doug Simon wrote:
>> Please review this small patch to fix an incorrect usage of GrowableArray that can leads to an assertion failure in a fastdebug VM.
>> 
>> Many thanks to Gilles Duboscq for the test showing the problem and confirming that the fix works.
>> 
>> https://bugs.openjdk.java.net/browse/JDK-8210066
>> http://cr.openjdk.java.net/~dnsimon/8210066/
>> 
>> Testing: hs-tier3-graal
>> 
>> -Doug
>