Recursion limit for one-char string replace and retire String::kMinNonFlatLength.

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 5c68ddff7fc10edd22ccf9536e171dcb41fce62c..3a667a4398f03f0d8f8fc132c9f1c5c00ecf11cc 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -388,7 +388,7 @@ void ConsString::ConsStringVerify() {
   CHECK(this->first()->IsString());
   CHECK(this->second() == GetHeap()->empty_string() ||
         this->second()->IsString());
-  CHECK(this->length() >= String::kMinNonFlatLength);
+  CHECK(this->length() >= ConsString::kMinLength);
   if (this->IsFlat()) {
     // A flat cons can only be created by String::SlowTryFlatten.
     // Afterwards, the first part may be externalized.