No need for dstrcmp in object.d (#3165)

No need for dstrcmp in object.d
merged-on-behalf-of: Mathias LANG <pro.mathias.lang@gmail.com>

Author: andralex

src/object.d

@@ -326,16 +326,14 @@ class TypeInfo
         return hashOf(this.toString());
     }
 
-    override int opCmp(Object o)
+    override int opCmp(Object rhs)
     {
-        import core.internal.string : dstrcmp;
-
-        if (this is o)
+        if (this is rhs)
             return 0;
-        TypeInfo ti = cast(TypeInfo)o;
+        auto ti = cast(TypeInfo) rhs;
         if (ti is null)
             return 1;
-        return dstrcmp(this.toString(), ti.toString());
+        return __cmp(this.toString(), ti.toString());
     }
 
     override bool opEquals(Object o)
@@ -3010,7 +3008,6 @@ private size_t getArrayHash(const scope TypeInfo element, const scope void* ptr,
             || cast(const TypeInfo_Interface) element;
     }
 
-    import core.internal.traits : externDFunc;
     if (!hasCustomToHash(element))
         return hashOf(ptr[0 .. elementSize * count]);