[patch/rfc] Rewrite "structs" testcase

[Michael Elizabeth Chastain]

Ah, this version is much beter.

The results are:

                        PASS  FAIL
  gcc 2.95.3 -gdwarf-2  290   3
  gcc 2.95.3 -gstabs+   290   3
  gcc 3.3.2  -gdwarf-2  290   3
  gcc 3.3.2  -gstabs+   290   3

The three FAIL results are:

  p/c fun1()^M
  $1 = {a = 0x08044004c400000000000000}^M
  (gdb) FAIL: gdb.base/structs.exp: p/c fun1() for call-tld 1

  p/c L1^M
  $3 = {a = 0x00004004c400000000000000}^M
  (gdb) FAIL: gdb.base/structs.exp: p/c L1 for call-tld 1

  p/c L1^M
  $1 = {a = 0 '\0'}^M
  (gdb) FAIL: gdb.base/structs.exp: p/c L1 for return-tc

All the test names are unique.

Michael C