I think you need to change the Crankshaft graph builder to bailout in case
of
let declarations. Otherwise, there won't be the expected behavior from
generated
code. e.g. the following example would optimize f and doesn't throw a
ReferenceError when invoking f(42, false) after optimization:
function f(x, b) {
let y = (b ? y : x) + 42;
return y;
}
for (var i=0; i<10000000; i++) f(42, false);
print(f(42, true));
http://codereview.chromium.org/7671042/
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