Detect idiom: deserializing 32 and 64-bit integers

```c++
NumericT<32> int32FromLEOffset(NumericT<8> * start){
return int32From2Int16(int16FromLEOffset(start), int16FromLEOffset(start + 2));
}
```
and generally

```c++
NumericT intNLEFromOffset(NumericT<8> * start){
return intNFrom2HalfIntNs(intNLEFromOffset(start), intNLEFromOffset(start + N/2/8));
}
```

Analogiously for big endian.

Start from the shown int32FromLEOffset and intNLEFromOffset patterns, then trace the corresponding big-endian deserialization logic. Determine where idiom detection belongs and verify that 32- and 64-bit little- and big-endian integer patterns are recognized as intended.

Written by the indexing model from the issue text.