[compiler] Fix typing of ToLength.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index 600940c897c4e0312183d6560a7bf21da1c2a8af..1055e11d3fb7c37682b63c06fdef0b808f58b505 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -454,9 +454,14 @@ Type* Typer::Visitor::ToLength(Type* type, Typer* t) {
   type = ToInteger(type, t);
   double min = type->Min();
   double max = type->Max();
+  if (max <= 0.0) {
+    return Type::NewConstant(0, t->zone());
+  }
+  if (min >= kMaxSafeInteger) {
+    return Type::NewConstant(kMaxSafeInteger, t->zone());
+  }
   if (min <= 0.0) min = 0.0;
-  if (max > kMaxSafeInteger) max = kMaxSafeInteger;
-  if (max <= min) max = min;
+  if (max >= kMaxSafeInteger) max = kMaxSafeInteger;
   return Type::Range(min, max, t->zone());
 }