[offbyone-branch] Fix d10v

[Andrew Cagney]

Hello,

The attached gets the d10v, on the offbyone-branch, working again.  Most 
of it is `uneventful'.  There is one nasty bit of work though:

  {
    /* See comment in "frame.h".  */
    gdb_assert (frame->next != NULL);
+  /* Fix up this PC's value.  */
    frame->pc = pc;
+  /* While we're at it, also update the cache, in NEXT, that also
+     contains that value.  */
+  frame->next->pc_unwind_cache = pc;
+  frame->next->pc_unwind_cache_p = 1;
  }

The d10v is a decr-pc-after break target and hence relies on 
deprecated_update_frame_pc_hack to fix the frame's PC.  Turns out that 
the hack has to also fix the cached copy of that PC in the previous 
frame (the information is redundently stored).  Ulgh.

A follow-on is to eliminate the d10v's reliance on that hack.

Andrew
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