runtime: Minor cleanup and extra comments around interpreter

Change-Id: I24c0b261de8cf737babd9d01bf679482d48c8bc9
diff --git a/runtime/mirror/class-inl.h b/runtime/mirror/class-inl.h
index 835b94a..8c9222f 100644
--- a/runtime/mirror/class-inl.h
+++ b/runtime/mirror/class-inl.h
@@ -666,7 +666,7 @@
 inline void Class::VisitReferences(mirror::Class* klass, const Visitor& visitor) {
   VisitInstanceFieldsReferences<kVisitClass>(klass, visitor);
   // Right after a class is allocated, but not yet loaded
-  // (kStatusNotReady, see ClassLinkder::LoadClass()), GC may find it
+  // (kStatusNotReady, see ClassLinker::LoadClass()), GC may find it
   // and scan it. IsTemp() may call Class::GetAccessFlags() but may
   // fail in the DCHECK in Class::GetAccessFlags() because the class
   // status is kStatusNotReady. To avoid it, rely on IsResolved()
diff --git a/runtime/mirror/string-inl.h b/runtime/mirror/string-inl.h
index 9f6cd11..8d9c08d 100644
--- a/runtime/mirror/string-inl.h
+++ b/runtime/mirror/string-inl.h
@@ -176,11 +176,13 @@
 }
 
 template <bool kIsInstrumented>
-inline String* String::AllocFromCharArray(Thread* self, int32_t array_length,
+inline String* String::AllocFromCharArray(Thread* self, int32_t count,
                                           Handle<CharArray> array, int32_t offset,
                                           gc::AllocatorType allocator_type) {
-  SetStringCountAndValueVisitorFromCharArray visitor(array_length, array, offset);
-  String* new_string = Alloc<kIsInstrumented>(self, array_length, allocator_type, visitor);
+  // It is a caller error to have a count less than the actual array's size.
+  DCHECK_GE(array->GetLength(), count);
+  SetStringCountAndValueVisitorFromCharArray visitor(count, array, offset);
+  String* new_string = Alloc<kIsInstrumented>(self, count, allocator_type, visitor);
   return new_string;
 }
 
diff --git a/runtime/mirror/string.h b/runtime/mirror/string.h
index a8f16d7..af06385 100644
--- a/runtime/mirror/string.h
+++ b/runtime/mirror/string.h
@@ -95,7 +95,7 @@
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
   template <bool kIsInstrumented>
-  ALWAYS_INLINE static String* AllocFromCharArray(Thread* self, int32_t array_length,
+  ALWAYS_INLINE static String* AllocFromCharArray(Thread* self, int32_t count,
                                                   Handle<CharArray> array, int32_t offset,
                                                   gc::AllocatorType allocator_type)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);