Replace destructure_tuple with tuple_extract instructions and destructure_struct with struct_extract instructions.
This canonicalization helps other optimizations to e.g. CSE tuple_extract/struct_extract.
Make filter APIs for UseList chainable by adding them to Sequence where Element == Operand
For example, it allows to write:
```
let singleUse = value.uses.ignoreDebugUses.ignoreUsers(ofType: EndAccessInst.self).singleUse
```
Also, add `UseList.getSingleUser(notOfType:)`
Eliminate the redundant instruction pair
```
%t = tuple (%0, %1, %2)
(%3, %4, %5) = destructure_tuple %t
```
and replace the results %3, %4, %5 with %0, %1, %2, respectively.
The same for structs.
