[turbofan] Improve typing rules for NumberFloor and NumberDivide.

src/compiler/type-cache.h

Index: src/compiler/type-cache.h
diff --git a/src/compiler/type-cache.h b/src/compiler/type-cache.h
index 392c3318e8b799021eb9c1dd70bae048307ca4e3..3d9801bc107c145a671221367a841e8f65cb6e59 100644
--- a/src/compiler/type-cache.h
+++ b/src/compiler/type-cache.h
@@ -64,6 +64,8 @@ class TypeCache final {
   Type* const kPositiveInteger = CreateRange(0.0, V8_INFINITY);
   Type* const kPositiveIntegerOrMinusZero =
       Type::Union(kPositiveInteger, Type::MinusZero(), zone());
+  Type* const kPositiveIntegerOrNaN =
+      Type::Union(kPositiveInteger, Type::NaN(), zone());
   Type* const kPositiveIntegerOrMinusZeroOrNaN =
       Type::Union(kPositiveIntegerOrMinusZero, Type::NaN(), zone());