Only call clear on prevector if it isn't trivially destructible and don't loop in clear

src/prevector.h

@@ -10,6 +10,7 @@
 #include <string.h>
 
 #include <iterator>
+#include <type_traits>
 
 #pragma pack(push, 1)
 /** Implements a drop-in replacement for std::vector<T> which stores up to N
@@ -382,11 +383,15 @@ public:
     iterator erase(iterator first, iterator last) {
         iterator p = first;
         char* endp = (char*)&(*end());
+        if (!std::is_trivially_destructible<T>::value) {
             while (p != last) {
                 (*p).~T();
                 _size--;
                 ++p;
             }
+        } else {
+            _size -= last - p;
+        }
         memmove(&(*first), &(*last), endp - ((char*)(&(*last))));
         return first;
     }
@@ -426,7 +431,9 @@ public:
     }
 
     ~prevector() {
+        if (!std::is_trivially_destructible<T>::value) {
             clear();
+        }
         if (!is_direct()) {
             free(_union.indirect);
             _union.indirect = NULL;