remove ssm and add string id

3rd/lua/lstate.h

@@ -130,8 +130,6 @@ typedef struct CallInfo {
 #define setoah(st,v)	((st) = ((st) & ~CIST_OAH) | (v))
 #define getoah(st)	((st) & CIST_OAH)
 
-/* SSM (short string map) See lstring.c */
-struct ssm_ref;
 
 /*
 ** 'global state', shared by all threads of this state
@@ -143,6 +141,7 @@ typedef struct global_State {
   l_mem GCdebt;  /* bytes allocated not yet compensated by the collector */
   lu_mem GCmemtrav;  /* memory traversed by the GC */
   lu_mem GCestimate;  /* an estimate of the non-garbage memory in use */
+  stringtable strt;  /* hash table for strings */
   TValue l_registry;
   lu_byte currentwhite;
   lu_byte gcstate;  /* state of garbage collector */
@@ -169,9 +168,6 @@ typedef struct global_State {
   TString *tmname[TM_N];  /* array with tag-method names */
   struct Table *mt[LUA_NUMTAGS];  /* metatables for basic types */
   TString *strcache[STRCACHE_N][STRCACHE_M];  /* cache for strings in API */
-  struct ssm_ref *strsave;
-  struct ssm_ref *strmark;
-  struct ssm_ref *strfix;
 } global_State;