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    [interpreter] Add basic framework for bytecode handler code generation. · 7877c4e0
    rmcilroy authored
    Adds basic support for generation of interpreter bytecode handler code
    snippets. The InterpreterAssembler class exposes a set of low level,
    interpreter specific operations which can be used to build a Turbofan
    graph. The Interpreter class generates a bytecode handler snippet for
    each bytecode by assembling operations using an InterpreterAssembler.
    
    Currently only two simple bytecodes are supported: LoadLiteral0 and Return.
    
    BUG=v8:4280
    LOG=N
    
    Review URL: https://codereview.chromium.org/1239793002
    
    Cr-Commit-Position: refs/heads/master@{#29814}
    7877c4e0
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