Fix assorted carelessness about Datum vs. int64 vs. uint64

Bugs introduced by commit 81c5e46c49

src/backend/utils/adt/arrayfuncs.c

@@ -4084,7 +4084,7 @@ hash_array_extended(PG_FUNCTION_ARGS)
 		{
 			/* Apply the hash function */
 			locfcinfo.arg[0] = elt;
-			locfcinfo.arg[1] = seed;
+			locfcinfo.arg[1] = Int64GetDatum(seed);
 			locfcinfo.argnull[0] = false;
 			locfcinfo.argnull[1] = false;
 			locfcinfo.isnull = false;

src/backend/utils/adt/date.c

@@ -2223,14 +2223,15 @@ Datum
 timetz_hash_extended(PG_FUNCTION_ARGS)
 {
 	TimeTzADT  *key = PG_GETARG_TIMETZADT_P(0);
-	uint64		seed = PG_GETARG_DATUM(1);
+	Datum		seed = PG_GETARG_DATUM(1);
 	uint64		thash;
 
 	/* Same approach as timetz_hash */
 	thash = DatumGetUInt64(DirectFunctionCall2(hashint8extended,
 											   Int64GetDatumFast(key->time),
 											   seed));
-	thash ^= DatumGetUInt64(hash_uint32_extended(key->zone, seed));
+	thash ^= DatumGetUInt64(hash_uint32_extended(key->zone,
+							DatumGetInt64(seed)));
 	PG_RETURN_UINT64(thash);
 }
 

src/backend/utils/adt/numeric.c

@@ -2285,7 +2285,7 @@ hash_numeric_extended(PG_FUNCTION_ARGS)
 								   hash_len * sizeof(NumericDigit),
 								   seed);
 
-	result = digit_hash ^ weight;
+	result = UInt64GetDatum(DatumGetUInt64(digit_hash) ^ weight);
 
 	PG_RETURN_DATUM(result);
 }

src/backend/utils/adt/rangetypes.c

@@ -1288,7 +1288,7 @@ Datum
 hash_range_extended(PG_FUNCTION_ARGS)
 {
 	RangeType  *r = PG_GETARG_RANGE(0);
-	uint64		seed = PG_GETARG_INT64(1);
+	Datum		seed = PG_GETARG_DATUM(1);
 	uint64		result;
 	TypeCacheEntry *typcache;
 	TypeCacheEntry *scache;
@@ -1335,7 +1335,8 @@ hash_range_extended(PG_FUNCTION_ARGS)
 		upper_hash = 0;
 
 	/* Merge hashes of flags and bounds */
-	result = hash_uint32_extended((uint32) flags, seed);
+	result = DatumGetUInt64(hash_uint32_extended((uint32) flags,
+												 DatumGetInt64(seed)));
 	result ^= lower_hash;
 	result = ROTATE_HIGH_AND_LOW_32BITS(result);
 	result ^= upper_hash;