https://chromiumcodereview.appspot.com/16035014/diff/1/src/hydrogen-instructions.cc
File src/hydrogen-instructions.cc (right):

https://chromiumcodereview.appspot.com/16035014/diff/1/src/hydrogen-instructions.cc#newcode3075
src/hydrogen-instructions.cc:3075: rep =
rep.generalize(observed_input_representation(1));
HUnaryMathOperation doesn't have observed input representations (because
these ops are just calls in full codegen, and call ICs don't observe
types of the call's arguments), it just falls back to the HValue default
implementation which returns None.

https://chromiumcodereview.appspot.com/16035014/

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