[Bug target/121105] New: `svfloat32x4_t{}` does not zero the registers

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121105

            Bug ID: 121105
           Summary: `svfloat32x4_t{}` does not zero the registers
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:
```
#include "arm_sve.h"

svfloat32x4_t e() {
  return svfloat32x4_t{};
}

```

I thought this would cause z0-z3 to be zero. But rather it stays in undefined
state.