Solving merge issue with use of tables in dump/undump

The use of tables in dump/undump to reuse strings did not exist in
the version that changed the representation of arrays, so it was not
corrected for the new API for tables.

ldump.c

@@ -116,10 +116,10 @@ static void dumpString (DumpState *D, TString *ts) {
   if (ts == NULL)
     dumpSize(D, 0);
   else {
-    const TValue *idx = luaH_getstr(D->h, ts);
-    if (ttisinteger(idx)) {  /* string already saved? */
+    TValue idx;
+    if (luaH_getstr(D->h, ts, &idx) == HOK) {  /* string already saved? */
       dumpSize(D, 1);  /* reuse a saved string */
-      dumpInt(D, ivalue(idx));  /* index of saved string */
+      dumpInt(D, ivalue(&idx));  /* index of saved string */
     }
     else {  /* must write and save the string */
       TValue key, value;  /* to save the string in the hash */
@@ -130,7 +130,7 @@ static void dumpString (DumpState *D, TString *ts) {
       D->nstr++;  /* one more saved string */
       setsvalue(D->L, &key, ts);  /* the string is the key */
       setivalue(&value, D->nstr);  /* its index is the value */
-      luaH_finishset(D->L, D->h, &key, idx, &value);  /* h[ts] = nstr */
+      luaH_set(D->L, D->h, &key, &value);  /* h[ts] = nstr */
       /* integer value does not need barrier */
     }
   }

lundump.c

@@ -143,8 +143,9 @@ static TString *loadStringN (LoadState *S, Proto *p) {
     return NULL;
   else if (size == 1) {  /* previously saved string? */
     int idx = loadInt(S);  /* get its index */
-    const TValue *stv = luaH_getint(S->h, idx);
-    return tsvalue(stv);
+    TValue stv;
+    luaH_getint(S->h, idx, &stv);
+    return tsvalue(&stv);
   }
   else if (size -= 2, size <= LUAI_MAXSHORTLEN) {  /* short string? */
     char buff[LUAI_MAXSHORTLEN];