[Bug tdep/22389] New: aarch64: watchpoints are not merged regression

["jan.kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22389

            Bug ID: 22389
           Summary: aarch64: watchpoints are not merged regression
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tdep
          Assignee: unassigned at sourceware dot org
          Reporter: jan.kratochvil at redhat dot com
  Target Milestone: ---

A tracker only.

As discussed in:
  Re: ping#2: [patch] aarch64: PR 19806: watchpoints: false negatives + PR
20207 contiguous ones
  https://sourceware.org/ml/gdb-patches/2017-10/msg00878.html

Formerly GDB did merge all watchpoints happening inside an 1/2/4/8 byte aligned
region to 8-byte boundary and then reused the same hardware watchpoint register
as they became the same.

New GDB does not merge them as it can properly prevent false positives (or
formerly false negatives).  But then it is now using separate hardware
watchpoint register for each different watchpoint - despite GDB could merge
adjacent watchpoints into a single register (without any false
positives/negatives side effects).

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