Merge pull request #2792 from jeremy-lunarg/hayes-2760

Return new allocator for copied containers

glslang/Include/PoolAlloc.h

@@ -306,6 +306,8 @@ public:
 
     TPoolAllocator& getAllocator() const { return allocator; }
 
+    pool_allocator select_on_container_copy_construction() const { return pool_allocator{}; }
+
 protected:
     pool_allocator& operator=(const pool_allocator&) { return *this; }
     TPoolAllocator& allocator;