LGTM. Please wait to land this (Haitao can do this for you) until the tree
re-opens when the current stability issues have been fixed.
https://codereview.chromium.org/174693002/diff/1/src/x64/lithium-x64.cc
File src/x64/lithium-x64.cc (right):
https://codereview.chromium.org/174693002/diff/1/src/x64/lithium-x64.cc#newcode2020
src/x64/lithium-x64.cc:2020: val = UseRegisterAtStart(instr->value());
This is a little shady, but probably OK. In the NaN canonicalization in
the code generator the value register get changed from one NaN to
another NaN... technically an overwrite, but harmless given how we treat
most NaNs uniformly, I think it's safe.
https://codereview.chromium.org/174693002/
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