Remove use of byte-masking macros in record_image_cmp

These were introduced in 4cbb6463, but
after further analysis and testing, they should not be necessary and
probably weren't the part of that commit that fixed anything.
Reviewed-by: Michael Paquier <michael.paquier@gmail.com>

src/backend/utils/adt/rowtypes.c

@@ -1467,45 +1467,8 @@ record_image_cmp(FunctionCallInfo fcinfo)
 			}
 			else if (att1->attbyval)
 			{
-				switch (att1->attlen)
-				{
-					case 1:
-						if (GET_1_BYTE(values1[i1]) !=
-							GET_1_BYTE(values2[i2]))
-						{
-							cmpresult = (GET_1_BYTE(values1[i1]) <
-										 GET_1_BYTE(values2[i2])) ? -1 : 1;
-						}
-						break;
-					case 2:
-						if (GET_2_BYTES(values1[i1]) !=
-							GET_2_BYTES(values2[i2]))
-						{
-							cmpresult = (GET_2_BYTES(values1[i1]) <
-										 GET_2_BYTES(values2[i2])) ? -1 : 1;
-						}
-						break;
-					case 4:
-						if (GET_4_BYTES(values1[i1]) !=
-							GET_4_BYTES(values2[i2]))
-						{
-							cmpresult = (GET_4_BYTES(values1[i1]) <
-										 GET_4_BYTES(values2[i2])) ? -1 : 1;
-						}
-						break;
-#if SIZEOF_DATUM == 8
-					case 8:
-						if (GET_8_BYTES(values1[i1]) !=
-							GET_8_BYTES(values2[i2]))
-						{
-							cmpresult = (GET_8_BYTES(values1[i1]) <
-										 GET_8_BYTES(values2[i2])) ? -1 : 1;
-						}
-						break;
-#endif
-					default:
-						Assert(false);	/* cannot happen */
-				}
+				if (values1[i1] != values2[i2])
+					cmpresult = (values1[i1] < values2[i2]) ? -1 : 1;
 			}
 			else
 			{
@@ -1739,29 +1702,7 @@ record_image_eq(PG_FUNCTION_ARGS)
 			}
 			else if (att1->attbyval)
 			{
-				switch (att1->attlen)
-				{
-					case 1:
-						result = (GET_1_BYTE(values1[i1]) ==
-								  GET_1_BYTE(values2[i2]));
-						break;
-					case 2:
-						result = (GET_2_BYTES(values1[i1]) ==
-								  GET_2_BYTES(values2[i2]));
-						break;
-					case 4:
-						result = (GET_4_BYTES(values1[i1]) ==
-								  GET_4_BYTES(values2[i2]));
-						break;
-#if SIZEOF_DATUM == 8
-					case 8:
-						result = (GET_8_BYTES(values1[i1]) ==
-								  GET_8_BYTES(values2[i2]));
-						break;
-#endif
-					default:
-						Assert(false);	/* cannot happen */
-				}
+				result = (values1[i1] == values2[i2]);
 			}
 			else
 			{