[Bug tdep/14673] Pseudo registers aren't updated in stack unwind

["simark at simark dot ca" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=14673

Simon Marchi <simark at simark dot ca> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #2 from Simon Marchi <simark at simark dot ca> ---
I believe this is fixed by my pseudo register series, that commit and the 20 or
so previous ones:

https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=f5d420bbceeb1d5065c3d91dd7c6c1e43f855ca1

When running:

./gdb -batch -nx -q --data-directory=data-directory test \                      
    -ex 'b foo' -ex r -ex bt \
    -ex 'frame 0' \
    -ex 'p/x $sp' -ex 'p/x $rsp' -ex 'p/x $esp' \
    -ex 'frame 1' \
    -ex 'p/x $sp' -ex 'p/x $rsp' -ex 'p/x $esp'

Before, I get:

    #0  foo (x=2) at test.c:3
    3         return x + 1;
    $1 = 0x7fffffffe180
    $2 = 0x7fffffffe180
    $3 = 0xffffe180

    #1  0x0000555555555146 in main () at test.c:8
    8         foo(2);
    $4 = 0x7fffffffe190
    $5 = 0x7fffffffe190
    $6 = 0xffffe180

After, I get:

    #0  foo (x=2) at test.c:3
    3         return x + 1;
    $1 = 0x7fffffffe180
    $2 = 0x7fffffffe180
    $3 = 0xffffe180

    #1  0x0000555555555146 in main () at test.c:8
    8         foo(2);
    $4 = 0x7fffffffe190
    $5 = 0x7fffffffe190
    $6 = 0xffffe190

From what I can tell, from amd64-tdep.c, the eip pseudo register exists only on
the x32 arch, which I can't test.  But if it's handled like all other dword
pseudo registers, it should work as well.

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