Bring some MSVC asserts in line with other platforms

MSVC's _BitScan* functions return a boolean indicating whether any
bits were set in the input, and we were previously asserting that
they returned true, per our API. This is correct. However, other
platforms simply assert that the input is non-zero, so do that to be
more consistent.

Noted while investigating a hypothesis from Ranier Vilela about
undefined behavior, but this is not his proposed patch.

Discussion: https://www.postgresql.org/message-id/CAEudQAoDhUZyKGJ1vbMGcgVUOcsixe-%3DjcVaDWarqkUg163D2w%40mail.gmail.com

src/include/port/pg_bitutils.h

@@ -48,8 +48,9 @@ pg_leftmost_one_pos32(uint32 word)
 	unsigned long result;
 	bool		non_zero;
 
+	Assert(word != 0);
+
 	non_zero = _BitScanReverse(&result, word);
-	Assert(non_zero);
 	return (int) result;
 #else
 	int			shift = 32 - 8;
@@ -85,8 +86,9 @@ pg_leftmost_one_pos64(uint64 word)
 	unsigned long result;
 	bool		non_zero;
 
+	Assert(word != 0);
+
 	non_zero = _BitScanReverse64(&result, word);
-	Assert(non_zero);
 	return (int) result;
 #else
 	int			shift = 64 - 8;
@@ -116,8 +118,9 @@ pg_rightmost_one_pos32(uint32 word)
 	unsigned long result;
 	bool		non_zero;
 
+	Assert(word != 0);
+
 	non_zero = _BitScanForward(&result, word);
-	Assert(non_zero);
 	return (int) result;
 #else
 	int			result = 0;
@@ -156,8 +159,9 @@ pg_rightmost_one_pos64(uint64 word)
 	unsigned long result;
 	bool		non_zero;
 
+	Assert(word != 0);
+
 	non_zero = _BitScanForward64(&result, word);
-	Assert(non_zero);
 	return (int) result;
 #else
 	int			result = 0;