[llvm-dwarfdump] Fix parsing DW_CFA_AARCH64_negate_ra_state (#84128)

The saved state of the AARCH64_DWARF_PAUTH_RA_STATE register was not
updated, so `llvm-dwarfdump` continued to dump it as `reg34=1` even if
the correct value is `0`:

```
> llvm-dwarfdump -v test.o
...
0000002c 00000024 00000030 FDE cie=00000000 pc=00000030...00000064
  Format:       DWARF32
  DW_CFA_advance_loc: 4
  DW_CFA_AARCH64_negate_ra_state:
  DW_CFA_advance_loc: 4
  DW_CFA_def_cfa_offset: +16
  DW_CFA_offset: W30 -16
  DW_CFA_remember_state:
  DW_CFA_advance_loc: 16
  DW_CFA_def_cfa_offset: +0
  DW_CFA_advance_loc: 4
  DW_CFA_AARCH64_negate_ra_state:
  DW_CFA_restore: W30
  DW_CFA_advance_loc: 4
  DW_CFA_restore_state:
  DW_CFA_advance_loc: 12
  DW_CFA_def_cfa_offset: +0
  DW_CFA_advance_loc: 4
  DW_CFA_AARCH64_negate_ra_state:
  DW_CFA_restore: W30
  DW_CFA_nop:

  0x30: CFA=WSP
  0x34: CFA=WSP: reg34=1
  0x38: CFA=WSP+16: W30=[CFA-16], reg34=1
  0x48: CFA=WSP: W30=[CFA-16], reg34=1
  0x4c: CFA=WSP: reg34=1               <--- should be '=0'
  0x50: CFA=WSP+16: W30=[CFA-16], reg34=1
  0x5c: CFA=WSP: W30=[CFA-16], reg34=1
  0x60: CFA=WSP: reg34=1               <--- should be '=0'
```