[Bug c++/29243] New: infinite loop in generic_value_print

["roland at gnu dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29243

            Bug ID: 29243
           Summary: infinite loop in generic_value_print
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
          Assignee: unassigned at sourceware dot org
          Reporter: roland at gnu dot org
  Target Milestone: ---

Created attachment 14142
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14142&action=edit
x86_64-linux-gnu target assembly source

The source to reproduce this is quite small. However, GCC 12 does not emit
DWARF that causes the issue in GDB.
Current ToT Clang does.  I've attached the .s file produced by Clang; turning
that into an object that you can load into gdb should reproduce the same
problem.

```
// clang++ -std=c++17 -O2 -g3 -gdwarf-5 -shared -o foo.so foo.cc                
// gdb foo.so                                                                   
// (gdb) i func                                                                 

struct S { bool x, y; };                                                        

namespace {                                                                     

template <auto M>                                                               
constexpr bool kFoo = true;                                                     

} //                                                                            

bool t() { return kFoo<&S::x>; }                                                

bool f() { return kFoo<&S::y>; }   
```

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