Nice, this is easier than I expected. LGTM with nits.
https://codereview.chromium.org/812353002/diff/1/src/hydrogen.cc
File src/hydrogen.cc (right):
https://codereview.chromium.org/812353002/diff/1/src/hydrogen.cc#newcode3068
src/hydrogen.cc:3068:
builder.If<HCompareObjectEqAndBranch>(expected_map, map);
nit: When several IfBuilders are at play, I like naming them by purpose,
e.g. "if_map_matches" or "map_check". Also, the builder sequence can be
made shorter and more readable:
IfBuilder map_check(this);
map_check.IfNot<HCompareObjectEqAndBranch>(expected_map, map);
map_check.ThenDeopt("Unknown map");
map_check.End();
https://codereview.chromium.org/812353002/diff/1/src/hydrogen.cc#newcode3073
src/hydrogen.cc:3073: } else {
nit: add a DCHECK(map_embedding == kEmbedMapsDirectly) as the first line
of the else-block, for documentation.
https://codereview.chromium.org/812353002/
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