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.
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