Better handling of size limit when resizing a table

Avoid silent conversions from int to unsigned int when calling
'luaH_resize'; avoid silent conversions from lua_Integer to int in
'table.create'; MAXASIZE corrected for the new implementation of arrays;
'luaH_resize' checks explicitly whether new size respects MAXASIZE.
(Even constructors were bypassing that check.)

testes/sort.lua

@@ -3,33 +3,6 @@
 
 print "testing (parts of) table library"
 
-do print "testing 'table.create'"
-  collectgarbage()
-  local m = collectgarbage("count") * 1024
-  local t = table.create(10000)
-  local memdiff = collectgarbage("count") * 1024 - m
-  assert(memdiff > 10000 * 4)
-  for i = 1, 20 do
-    assert(#t == i - 1)
-    t[i] = 0
-  end
-  for i = 1, 20 do  t[#t + 1] = i * 10  end
-  assert(#t == 40 and t[39] == 190)
-  assert(not T or T.querytab(t) == 10000)
-  t = nil
-  collectgarbage()
-  m = collectgarbage("count") * 1024
-  t = table.create(0, 1024)
-  memdiff = collectgarbage("count") * 1024 - m
-  assert(memdiff > 1024 * 12)
-  assert(not T or select(2, T.querytab(t)) == 1024)
-end
-
-
-print "testing unpack"
-
-local unpack = table.unpack
-
 local maxI = math.maxinteger
 local minI = math.mininteger
 
@@ -40,6 +13,38 @@ local function checkerror (msg, f, ...)
 end
 
 
+do print "testing 'table.create'"
+  local N = 10000
+  collectgarbage()
+  local m = collectgarbage("count") * 1024
+  local t = table.create(N)
+  local memdiff = collectgarbage("count") * 1024 - m
+  assert(memdiff > N * 4)
+  for i = 1, 20 do
+    assert(#t == i - 1)
+    t[i] = 0
+  end
+  for i = 1, 20 do  t[#t + 1] = i * 10  end
+  assert(#t == 40 and t[39] == 190)
+  assert(not T or T.querytab(t) == N)
+  t = nil
+  collectgarbage()
+  m = collectgarbage("count") * 1024
+  t = table.create(0, 1024)
+  memdiff = collectgarbage("count") * 1024 - m
+  assert(memdiff > 1024 * 12)
+  assert(not T or select(2, T.querytab(t)) == 1024)
+
+  checkerror("table overflow", table.create, (1<<31) + 1)
+  checkerror("table overflow", table.create, 0, (1<<31) + 1)
+end
+
+
+print "testing unpack"
+
+local unpack = table.unpack
+
+
 checkerror("wrong number of arguments", table.insert, {}, 2, 3, 4)
 
 local x,y,z,a,n