• mstarzinger's avatar
    [interpreter] Add ability to preserve bytecode. · 9e60db1f
    mstarzinger authored
    This adds the --ignition-preserve-bytecode flag which will preserve any
    existing bytecode, even if a tier-up to baseline code is performed. This
    is preparatory work in order to allow mixed stacks where bytecode and
    baseline code can be active at the same time.
    
    It also adds a {HasBaselineCode} predicate symmetric to the existing
    {HasBytecodeArray} predicate. Both predicates are independent and any
    combination of answers is valid.
    
    Further adaptation of the rest of the runtime will be done step-wise in
    follow-up changes.
    
    R=yangguo@chromium.org
    BUG=v8:5265
    
    Review-Url: https://codereview.chromium.org/2224923003
    Cr-Commit-Position: refs/heads/master@{#38540}
    9e60db1f
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