LGTM if comments are addressed.

https://codereview.chromium.org/113343003/diff/40001/src/arm/lithium-codegen-arm.cc
File src/arm/lithium-codegen-arm.cc (right):

https://codereview.chromium.org/113343003/diff/40001/src/arm/lithium-codegen-arm.cc#newcode3939
src/arm/lithium-codegen-arm.cc:3939: __
CallCFunction(ExternalReference::math_log_double_function(isolate()),
I just took a look at ExternalReference::math_log_double_function.

It refers to math_log_double whose only purpose is to wrap log, which
has the same function signature. Are we sure the C++ compiler will
inline this? Could this external reference directly refer to log?

https://codereview.chromium.org/113343003/diff/40001/src/mips/lithium-mips.cc
File src/mips/lithium-mips.cc (right):

https://codereview.chromium.org/113343003/diff/40001/src/mips/lithium-mips.cc#newcode1204
src/mips/lithium-mips.cc:1204: LOperand* input =
UseRegister(instr->value());
We are not using a fixed double register anymore. Do we then get a
double register assigned?

https://codereview.chromium.org/113343003/

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