PA: Take zero as a bool rather than as a bool *.

Now that we've moved junking to a higher level of the allocation stack, we don't
care about this performance optimization (which only occurred in debug modes).

include/jemalloc/internal/arena_externs.h

@@ -33,7 +33,7 @@ void arena_handle_new_dirty_pages(tsdn_t *tsdn, arena_t *arena);
 size_t arena_slab_regind(edata_t *slab, szind_t binind, const void *ptr);
 #endif
 edata_t *arena_extent_alloc_large(tsdn_t *tsdn, arena_t *arena,
-    size_t usize, size_t alignment, bool *zero);
+    size_t usize, size_t alignment, bool zero);
 void arena_extent_dalloc_large_prep(tsdn_t *tsdn, arena_t *arena,
     edata_t *edata);
 void arena_extent_ralloc_large_shrink(tsdn_t *tsdn, arena_t *arena,

include/jemalloc/internal/pa.h

@@ -195,10 +195,10 @@ size_t pa_shard_extent_sn_next(pa_shard_t *shard);
 
 /* Gets an edata for the given allocation. */
 edata_t *pa_alloc(tsdn_t *tsdn, pa_shard_t *shard, size_t size,
-    size_t alignment, bool slab, szind_t szind, bool *zero);
+    size_t alignment, bool slab, szind_t szind, bool zero);
 /* Returns true on error, in which case nothing changed. */
 bool pa_expand(tsdn_t *tsdn, pa_shard_t *shard, edata_t *edata, size_t old_size,
-    size_t new_size, szind_t szind, bool slab, bool *zero);
+    size_t new_size, szind_t szind, bool slab, bool zero);
 /*
  * The same.  Sets *generated_dirty to true if we produced new dirty pages, and
  * false otherwise.