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[Bug breakpoints/22301] [AARCH64] can't place breakpoint on STP of double registers


https://sourceware.org/bugzilla/show_bug.cgi?id=22301

--- Comment #2 from Isaac <IsaacOscar at hotmail dot com> ---
Interestingly, adding a breakpoint to the actual first instruction of main
works, but using 'si' after breaking dosn't:

```
(gdb) b *&main
Breakpoint 1 at 0x400570
(gdb) r
Starting program: /home/isaacg/a.out

Breakpoint 1, 0x0000000000400570 in main ()
(gdb) si
/build/gdb-g58BK_/gdb-7.11.1/gdb/aarch64-tdep.c:334: internal-error:
aarch64_analyze_prologue: Assertion `inst.operands[0].type == AARCH64_OPND_Rt'
failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) y

This is a bug, please report it.  For instructions, see:
<http://www.gnu.org/software/gdb/bugs/>.

/build/gdb-g58BK_/gdb-7.11.1/gdb/aarch64-tdep.c:334: internal-error:
aarch64_analyze_prologue: Assertion `inst.operands[0].type == AARCH64_OPND_Rt'
failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Create a core file of GDB? (y or n) y
Aborted (core dumped)
```

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