Using vframeStream as the iterator and vframeStream:asJavaVFrame to get the vframe can make this code faster and easier to maintain. 
            
- duplicates
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                    JDK-8269592 [JVMCI] Optimize c2v_iterateFrames -           
- Resolved
 
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- relates to
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                    JDK-8261846 [JVMCI] c2v_iterateFrames can get out of sync with the StackFrameStream -           
- Resolved
 
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