[Bug target/52268] tls support should be added for darwin11

[mikestump at comcast dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52268

--- Comment #1 from Mike Stump <mikestump at comcast dot net> 2012-02-16 
17:15:47 UTC ---
If you could snapshot some codegen, say

  void foo() {
    static __thread int i = 42;
    ++i;
  }

or somesuch, we could see if they wired it up the same was as gcc is normally
wired.  I suspect it should be fairly close.  I'm thinking this should be easy
to wire up.