[Bug tdep/29408] [gdb, tdep/aarch64] FAIL: gdb.base/large-frame.exp: optimize=-O0: backtrace

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29408

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 14255
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14255&action=edit
Tentative patch

Fixes the failures:
...
Running /home/tdevries/gdb/src/gdb/testsuite/gdb.base/large-frame.exp ...

                === gdb Summary ===

# of expected passes            6
...

We do slightly overshoot:
...
$ gdb -q -batch ./outputs/gdb.base/large-frame/large-frame-O0 -ex "b func"
Breakpoint 1 at 0x400624
...
because according to the line info (which we can see if we compile
large-frame-2.c with debug info), the first insn after the prologue is
0x400620:
...
0000000000400610 <func>:
  400610:       d2880210        mov     x16, #0x4010                    //
#16400
  400614:       cb3063ff        sub     sp, sp, x16
  400618:       a9007bfd        stp     x29, x30, [sp]
  40061c:       910003fd        mov     x29, sp
  400620:       910043a0        add     x0, x29, #0x10
  400624:       97fffff0        bl      4005e4 <blah>
  400628:       52800000        mov     w0, #0x0                        // #0
  40062c:       a9407bfd        ldp     x29, x30, [sp]
  400630:       d2880210        mov     x16, #0x4010                    //
#16400
  400634:       8b3063ff        add     sp, sp, x16
  400638:       d65f03c0        ret
  40063c:       d503201f        nop
...
but that is a pre-existing problem.

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