Fix yet more portability bugs in integerset and its tests.

There were more large constants that needed UINT64CONST. And one variable
was declared as "int", when it needed to be uint64. These bugs were only
visible on 32-bit systems; clearly I should've tested on one, given that
this code does a lot of work with 64-bit integers.

Also, in the test "huge distances" test, the code created some values with
random distances between them, but the test logic didn't take into account
the possibility that the random distance was exactly 1. That never actually
happens with the seed we're using, but let's be tidy.

src/backend/lib/integerset.c

@@ -845,7 +845,7 @@ static const struct
  * This value looks like a 0-mode codeword,  but we check for it
  * specifically.  (In a real 0-mode codeword, all the unused bits are zero.)
  */
-#define EMPTY_CODEWORD		(0xFFFFFFFFFFFFFFF0)
+#define EMPTY_CODEWORD		UINT64CONST(0xFFFFFFFFFFFFFFF0)
 
 /*
  * Encode a number of integers into a Simple-8b codeword.
@@ -885,7 +885,7 @@ simple8b_encode(uint64 *ints, int *num_encoded, uint64 base)
 	i = 0;
 	for (;;)
 	{
-		if (diff >= (1L << bits))
+		if (diff >= (UINT64CONST(1) << bits))
 		{
 			/* too large, step up to next mode */
 			selector++;
@@ -948,7 +948,7 @@ simple8b_decode(uint64 codeword, uint64 *decoded, uint64 base)
 	int			selector = codeword & 0x0f;
 	int			nints = simple8b_modes[selector].num_ints;
 	uint64		bits = simple8b_modes[selector].bits_per_int;
-	uint64		mask = (1L << bits) - 1;
+	uint64		mask = (UINT64CONST(1) << bits) - 1;
 	uint64		prev_value;
 
 	if (codeword == EMPTY_CODEWORD)
@@ -961,7 +961,7 @@ simple8b_decode(uint64 codeword, uint64 *decoded, uint64 base)
 	{
 		uint64		diff = codeword & mask;
 
-		decoded[i] = prev_value + 1L + diff;
+		decoded[i] = prev_value + 1 + diff;
 		prev_value = decoded[i];
 		codeword >>= bits;
 	}
@@ -992,7 +992,7 @@ simple8b_contains(uint64 codeword, uint64 key, uint64 base)
 	}
 	else
 	{
-		int			mask = (1L << bits) - 1;
+		uint64		mask = (UINT64CONST(1) << bits) - 1;
 		uint64		prev_value;
 
 		prev_value = base;
@@ -1001,7 +1001,7 @@ simple8b_contains(uint64 codeword, uint64 key, uint64 base)
 			uint64		diff = codeword & mask;
 			uint64		curr_value;
 
-			curr_value = prev_value + 1L + diff;
+			curr_value = prev_value + 1 + diff;
 
 			if (curr_value >= key)
 			{

src/test/modules/test_integerset/test_integerset.c

@@ -590,12 +590,14 @@ test_huge_distances(void)
 	for (int i = 0; i < num_values; i++)
 	{
 		uint64		x = values[i];
+		bool		expected;
 		bool		result;
 
 		if (x > 0)
 		{
+			expected = (values[i - 1] == x - 1);
 			result = intset_is_member(intset, x - 1);
-			if (result != false)
+			if (result != expected)
 				elog(ERROR, "intset_is_member failed for " UINT64_FORMAT, x - 1);
 		}
 
@@ -603,8 +605,9 @@ test_huge_distances(void)
 		if (result != true)
 			elog(ERROR, "intset_is_member failed for " UINT64_FORMAT, x);
 
+		expected = (i != num_values - 1) ? (values[i + 1] == x + 1) : false;
 		result = intset_is_member(intset, x + 1);
-		if (result != false)
+		if (result != expected)
 			elog(ERROR, "intset_is_member failed for " UINT64_FORMAT, x + 1);
 	}