Make UNIV_DEBUG Valgrind friendly. Use | instead of +,

and mask out the dont-care bits in debug assertions.

storage/innodb_plugin/include/mach0data.ic

@@ -36,7 +36,7 @@ mach_write_to_1(
 	ulint	n)	/*!< in: ulint integer to be stored, >= 0, < 256 */
 {
 	ut_ad(b);
-	ut_ad(n <= 0xFFUL);
+	ut_ad((n | 0xFFUL) <= 0xFFUL);
 
 	b[0] = (byte)n;
 }
@@ -65,7 +65,7 @@ mach_write_to_2(
 	ulint	n)	/*!< in: ulint integer to be stored */
 {
 	ut_ad(b);
-	ut_ad(n <= 0xFFFFUL);
+	ut_ad((n | 0xFFFFUL) <= 0xFFFFUL);
 
 	b[0] = (byte)(n >> 8);
 	b[1] = (byte)(n);
@@ -81,10 +81,7 @@ mach_read_from_2(
 /*=============*/
 	const byte*	b)	/*!< in: pointer to 2 bytes */
 {
-	ut_ad(b);
-	return( ((ulint)(b[0]) << 8)
-		+ (ulint)(b[1])
-		);
+	return(((ulint)(b[0]) << 8) | (ulint)(b[1]));
 }
 
 /********************************************************//**
@@ -129,7 +126,7 @@ mach_write_to_3(
 	ulint	n)	/*!< in: ulint integer to be stored */
 {
 	ut_ad(b);
-	ut_ad(n <= 0xFFFFFFUL);
+	ut_ad((n | 0xFFFFFFUL) <= 0xFFFFFFUL);
 
 	b[0] = (byte)(n >> 16);
 	b[1] = (byte)(n >> 8);
@@ -148,8 +145,8 @@ mach_read_from_3(
 {
 	ut_ad(b);
 	return( ((ulint)(b[0]) << 16)
-		+ ((ulint)(b[1]) << 8)
-		+ (ulint)(b[2])
+		| ((ulint)(b[1]) << 8)
+		| (ulint)(b[2])
 		);
 }
 
@@ -183,9 +180,9 @@ mach_read_from_4(
 {
 	ut_ad(b);
 	return( ((ulint)(b[0]) << 24)
-		+ ((ulint)(b[1]) << 16)
-		+ ((ulint)(b[2]) << 8)
-		+ (ulint)(b[3])
+		| ((ulint)(b[1]) << 16)
+		| ((ulint)(b[2]) << 8)
+		| (ulint)(b[3])
 		);
 }
 
@@ -721,7 +718,7 @@ mach_read_from_2_little_endian(
 /*===========================*/
 	const byte*	buf)		/*!< in: from where to read */
 {
-	return((ulint)(*buf) + ((ulint)(*(buf + 1))) * 256);
+	return((ulint)(buf[0]) | ((ulint)(buf[1]) << 8));
 }
 
 /*********************************************************//**