https://codereview.chromium.org/50213003/diff/70001/src/hydrogen-instructions.h
File src/hydrogen-instructions.h (right):
https://codereview.chromium.org/50213003/diff/70001/src/hydrogen-instructions.h#newcode2828
src/hydrogen-instructions.h:2828: map->has_migrated()) {
The map cannot both be a migration target and have migrated. Currently
this disables the feature entirely. I think what you want is limit the
scope in which "is_migration_target" is set to true; eg only if the map
was ever used in a migration.
https://codereview.chromium.org/50213003/
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