[CodeExtractor] Consider Value arguments of dbg.assign (#67987)

Currently, the code extractor functionality deletes a debug intrinsic if
its "Location" argument is not part of the extracted function. The
location is the first argument (or the first few arguments in case of a
DIArgList) of all debug intrinsics.

However, according to the docs, the signature of dbg.assign is:

```
void @llvm.dbg.assign(Value *Value,
                      DIExpression *ValueExpression,
                      DILocalVariable *Variable,
                      DIAssignID *ID,
                      Value *Address,
                      DIExpression *AddressExpression)
```

That is, there are two `Value` arguments to it: the usual location
argument and an "Address" argument. This Address argument should also
receive the same treatment.