[Bug python/16286] New: value.string(length = x) broken for common variable length arrays idiom

["dje at google dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16286

            Bug ID: 16286
           Summary: value.string(length = x) broken for common variable
                    length arrays idiom
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: dje at google dot com

The fix for PR 16196 broke reading strings of variable length arrays that use
the common idiom of having a trailing 1 byte array at the end of a struct.

struct str
{
  int length;
  /* Variable length.  */
  char text[1];
};

(gdb) python xstr = gdb.parse_and_eval('xstr')
(gdb) python print xstr['text'].string (length = xstr['length'])
x

What should happen is that the entire string of length "length" is printed.

Patch and testcase to follow.

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