https://codereview.chromium.org/1217603005/diff/1/src/runtime/runtime-function.cc
File src/runtime/runtime-function.cc (right):

https://codereview.chromium.org/1217603005/diff/1/src/runtime/runtime-function.cc#newcode448
src/runtime/runtime-function.cc:448: Handle<Map> bound_function_map =
Map::Copy(
Forcing map creation here seems possibly bad. If you bind the same
function over and over again this'll create a plethora of new maps.

Can you use Map::TransitionToPrototype() here instead?

https://codereview.chromium.org/1217603005/

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