Move reentrancy_level to the beginning of TSD.

include/jemalloc/internal/tsd_structs.h

@@ -26,8 +26,8 @@ struct tsd_init_head_s {
  * t: tcache
  * --- data not accessed on tcache fast path: arena related fields ---
  * d: arenas_tdata_bypass
- * r: narenas_tdata
- * x: blank space (1 byte)
+ * r: reentrancy_level
+ * x: narenas_tdata
  * i: iarena
  * a: arena
  * o: arenas_tdata
@@ -36,7 +36,7 @@ struct tsd_init_head_s {
  * Use a compact layout to reduce cache footprint.
  * +--- 64-bit and 64B cacheline; 1B each letter; First byte on the left. ---+
  * |----------------------------  1st cacheline  ----------------------------|
- * | sedxrrrr mmmmmmmm ffffffff pppppppp [c * 32  ........ ........ .......] |
+ * | sedrxxxx mmmmmmmm ffffffff pppppppp [c * 32  ........ ........ .......] |
  * |----------------------------  2nd cacheline  ----------------------------|
  * | [c * 64  ........ ........ ........ ........ ........ ........ .......] |
  * |----------------------------  3nd cacheline  ----------------------------|
@@ -53,6 +53,7 @@ struct tsd_init_head_s {
 /*  O(name,			type,		[gs]et,	init,	cleanup) */ \
     O(tcache_enabled,		bool,		yes,	yes,	no)	\
     O(arenas_tdata_bypass,	bool,		no,	no,	no)	\
+    O(reentrancy_level,		int8_t,		no,	no,	no)	\
     O(narenas_tdata,		uint32_t,	yes,	no,	no)	\
     O(thread_allocated,		uint64_t,	yes,	no,	no)	\
     O(thread_deallocated,	uint64_t,	yes,	no,	no)	\
@@ -65,8 +66,7 @@ struct tsd_init_head_s {
     O(witnesses,		witness_list_t,	no,	no,	yes)	\
     O(rtree_leaf_elm_witnesses,	rtree_leaf_elm_witness_tsd_t,		\
 						no,	no,	no)	\
-    O(witness_fork,		bool,		yes,	no,	no)	\
-    O(reentrancy_level,		int,		no,	no,	no)
+    O(witness_fork,		bool,		yes,	no,	no)
 
 #define TSD_INITIALIZER {						\
     tsd_state_uninitialized,						\
@@ -75,6 +75,7 @@ struct tsd_init_head_s {
     0,									\
     0,									\
     0,									\
+    0,									\
     NULL,								\
     RTREE_CTX_ZERO_INITIALIZER,						\
     NULL,								\
@@ -83,8 +84,7 @@ struct tsd_init_head_s {
     TCACHE_ZERO_INITIALIZER,						\
     ql_head_initializer(witnesses),					\
     RTREE_ELM_WITNESS_TSD_INITIALIZER,					\
-    false,								\
-    0									\
+    false								\
 }
 
 struct tsd_s {