[Bug gcov-profile/119618] Python PGO vs musttail (error: cannot tail-call: memory reference or volatile after call)

[sjames at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119618

--- Comment #4 from Sam James <sjames at gcc dot gnu.org> ---
```
typedef struct {
  int a;
} b;
b c;
int d;
void e(int *);
int f() {
  {
    b g = c;
    e((int *)g.a);
    if (d) [[clang::musttail]]
      return f();
  }
  return 1;
}
```

This has slightly different behaviour as it works at -O2 -fprofile-generate -g,
but fails at -O1 -fprofile-generate -g.