[Bug breakpoints/17000] user breakpoint not inserted if software-single-step at same location

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https://sourceware.org/bugzilla/show_bug.cgi?id=17000

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https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=03388bb71c1a1d1c613bb963f3d9287cfd100138

commit 03388bb71c1a1d1c613bb963f3d9287cfd100138
Author: Yao Qi <yao@codesourcery.com>
Date:   Wed Jun 4 13:03:19 2014 +0800

    Tweak sss-bp-on-user-bp.exp

    sss-bp-on-user-bp.c has an assumption that write to integer can be
    compiled to a single instruction, which isn't true on some arch, such
    as arm.  This test requires setting two breakpoints on two consecutive
    instructions, so this patch is to get the address of the next
    instruction via disassemble and set the 2nd breakpoint there.  This
    approach is portable.

    This patch fixes the fails in sss-bp-on-user-bp.exp on arm-none-abi
    target.  There is no change in x86 test results.  I also revert the
    patch to PR breakpoints/17000, and verified that the patched
    sss-bp-on-user-bp.exp still trigger the fail on
    x86-with-software-single-step.

    gdb/testsuite:

    2014-06-04  Yao Qi  <yao@codesourcery.com>

        * gdb.base/sss-bp-on-user-bp.c (main): Remove comments.
        * gdb.base/sss-bp-on-user-bp.exp: Don't set breakpoint on
        "set bar break here".  Get the next instruction address and
        set breakpoint there.  Remove "bar break" from the regexp
        patterns.

-----------------------------------------------------------------------

Summary of changes:
 gdb/testsuite/gdb.base/sss-bp-on-user-bp.c   |    4 ++--
 gdb/testsuite/gdb.base/sss-bp-on-user-bp.exp |   20 +++++++++++++++++---
 2 files changed, 19 insertions(+), 5 deletions(-)

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