Cleanup: constexpr PFS_table_context::m_word_size

storage/perfschema/pfs_engine_table.cc

@@ -154,7 +154,6 @@ bool PFS_table_context::initialize(void)
       m_map= context->m_map;
       DBUG_ASSERT(m_map_size == context->m_map_size);
       m_map_size= context->m_map_size;
-      m_word_size= context->m_word_size;
     }
   }
   else
@@ -168,7 +167,6 @@ bool PFS_table_context::initialize(void)
     /* Initialize a new context, store in TLS. */
     m_last_version= m_current_version;
     m_map= NULL;
-    m_word_size= sizeof(ulong) * 8;
 
     /* Allocate a bitmap to record which threads are materialized. */
     if (m_map_size > 0)
@@ -190,7 +188,7 @@ bool PFS_table_context::initialize(void)
 /* Constructor for global or single thread tables, map size = 0.  */
 PFS_table_context::PFS_table_context(ulonglong current_version, bool restore, thread_local_key_t key) :
                    m_thr_key(key), m_current_version(current_version), m_last_version(0),
-                   m_map(NULL), m_map_size(0), m_word_size(sizeof(ulong)),
+                   m_map(NULL), m_map_size(0),
                    m_restore(restore), m_initialized(false), m_last_item(0)
 {
   initialize();
@@ -199,7 +197,7 @@ PFS_table_context::PFS_table_context(ulonglong current_version, bool restore, th
 /* Constructor for by-thread or aggregate tables, map size = max thread/user/host/account. */
 PFS_table_context::PFS_table_context(ulonglong current_version, ulong map_size, bool restore, thread_local_key_t key) :
                    m_thr_key(key), m_current_version(current_version), m_last_version(0),
-                   m_map(NULL), m_map_size(map_size), m_word_size(sizeof(ulong)),
+                   m_map(NULL), m_map_size(map_size),
                    m_restore(restore), m_initialized(false), m_last_item(0)
 {
   initialize();

storage/perfschema/pfs_engine_table.h

@@ -74,7 +74,7 @@ class PFS_table_context
   ulonglong m_last_version;
   ulong *m_map;
   ulong m_map_size;
-  ulong m_word_size;
+  static constexpr ulong m_word_size= 8 * sizeof(ulong);
   bool m_restore;
   bool m_initialized;
   ulong m_last_item;