Fixed the range information for string lengths.

src/compiler/access-builder.cc

Index: src/compiler/access-builder.cc
diff --git a/src/compiler/access-builder.cc b/src/compiler/access-builder.cc
index c69f22cb870fb7361774aa4322867555c3b61f08..9e5a0bbb8d84268d3117cf12ba10be0f57a82cca 100644
--- a/src/compiler/access-builder.cc
+++ b/src/compiler/access-builder.cc
@@ -59,10 +59,9 @@ FieldAccess AccessBuilder::ForMapInstanceType() {
 
 
 // static
-FieldAccess AccessBuilder::ForStringLength() {
+FieldAccess AccessBuilder::ForStringLength(Zone* zone) {
   return {kTaggedBase, String::kLengthOffset, Handle<Name>(),
-          Type::Intersect(Type::UnsignedSmall(), Type::TaggedSigned()),
-          kMachAnyTagged};
+          Type::Range(0, String::kMaxLength, zone), kMachAnyTagged};
 }