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    Revert of [heap] Add page evacuation mode for new->new (patchset #18 id:440001... · 2263ee9b
    mlippautz authored
    Revert of [heap] Add page evacuation mode for new->new (patchset #18 id:440001 of https://codereview.chromium.org/1957323003/ )
    
    Reason for revert:
    Fragmentation of LABs could result in increasing memory usage (pages) instead of shrinking.
    
    BUG=chromium:620320
    LOG=N
    
    Original issue's description:
    > [heap] Add page evacuation mode for new->new
    >
    > Adds an evacuation mode that allows moving pages within new space without
    > copying objects.
    >
    > Basic idea:
    > a) Move page within new space
    > b) Sweep page to make iterable and process ArrayBuffers
    > c) Finish sweep till next scavenge
    >
    > Threshold is currently 70% live bytes, i.e., the same threshold we use
    > to determine fragmented pages.
    >
    > BUG=chromium:581412
    > LOG=N
    > CQ_EXTRA_TRYBOTS=tryserver.v8:v8_linux_arm64_gc_stress_dbg,v8_linux_gc_stress_dbg,v8_mac_gc_stress_dbg,v8_linux64_tsan_rel,v8_mac64_asan_rel
    >
    > Committed: https://crrev.com/49b23201671b25092a3c22eb85783f39b95a5f87
    > Cr-Commit-Position: refs/heads/master@{#36990}
    
    TBR=ulan@chromium.org
    # Not skipping CQ checks because original CL landed more than 1 days ago.
    BUG=chromium:581412
    
    Review-Url: https://codereview.chromium.org/2063013005
    Cr-Commit-Position: refs/heads/master@{#37042}
    2263ee9b
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