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    PPC/s390: [liveedit] reimplement frame restarting. · 9515f7ed
    bjaideep authored
    Port 3f47c63d
    
    Original Commit Message:
    
        Previously, when restarting a frame, we would rewrite all frames
        between the debugger activation and the frame to restart to squash
        them, and replace the return address with that of a builtin to
        leave that rewritten frame, and restart the function by calling it.
    
        We now simply remember the frame to drop to, and upon returning
        from the debugger, we check whether to drop the frame, load the
        new FP, and restart the function.
    
    R=yangguo@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
    BUG=v8:5587
    LOG=N
    
    Review-Url: https://codereview.chromium.org/2663453004
    Cr-Commit-Position: refs/heads/master@{#42748}
    9515f7ed
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