Depends on:
* https://github.com/llvm/llvm-project/pull/168725
When compiling with `-glldb`, we repoint the `DW_AT_type` of a DIE to be
a typedef that refers to the `preferred_name`. I.e.,:
```
template <typename T> structure t7;
using t7i = t7<int>;
template <typename T> struct __attribute__((__preferred_name__(t7i))) t7 {};
template <typename... Ts> void f1()
int main() { f1<t7i>(); }
```
would produce following (minified) DWARF:
```
DW_TAG_subprogram
DW_AT_name ("_STN|f1|<t7<int> >")
DW_TAG_template_type_parameter
DW_AT_type (0x0000299c "t7i")
...
DW_TAG_typedef
DW_AT_type (0x000029a7 "t7<int>")
DW_AT_name ("t7i")
```
Note how the `DW_AT_type` of the template parameter is a typedef itself
(instead of the canonical type). The `DWARFTypePrinter` would take the
`DW_AT_name` of this typedef when reconstructing the name of `f1`, so we
would end up with a verifier failure:
```
error: Simplified template DW_AT_name could not be reconstituted:
original: f1<t7<int> >
reconstituted: f1<t7i>
```
Fixing this allows us to un-XFAIL the `simplified-template-names.cpp`
test in `cross-project-tests`. Unfortunately this is only tested on
Darwin, where LLDB tuning is the default. AFAIK, there is no other case
where the template parameter type wouldn't be canonical.
e96cc99687