Regression with .gitkeep in project init. List.init incorrectly didn't have the first argument the allocator. Added .init to priority queue. Created mem thread allocator alias. Correctly handle ident aliases. Allow ident on builtin aliases.

lib/std/core/mem_allocator.c3

@@ -360,6 +360,7 @@ macro void*! @aligned_realloc(#calloc_fn, #free_fn, void* old_pointer, usz bytes
 // All allocators
 
 
+def mem = thread_allocator @builtin;
 tlocal Allocator thread_allocator @private = base_allocator();
 Allocator temp_base_allocator @private = base_allocator();