[Patch] Speedup locale::operator==

[Paolo Carlini]

Hi,

I noticed some time ago that we (*) weren't exploting the ref-counted
nature of locale in operator==.

For this stupid testcase (P4-2400, -O2):

  std::locale loc1("fr_FR");
  std::locale loc2 = loc1;
  bool test = false;
  for (int i = 0; i < 10000000; ++i)
    if (loc2 == loc1)
      test = true;

current mainline
----------------
5.190u 0.000s 0:05.21 99.6%     0+0k 0+0io 245pf+0w

patched
-------
0.150u 0.000s 0:00.15 100.0%    0+0k 0+0io 242pf+0w

Regtested x86-linux, will commit later.

Paolo.

(*) At variance with our famous competitor ;) ...

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