[trans-mem] tm_wrap support

[Richard Henderson <rth at redhat dot com>]

In addition to all function cloning that the compiler can do for you 
automatically, the language spec allows for the programmer to build his 
own transaction-safe function variants.  I get the idea that the primary 
reason to do this is to build transaction-safe variants of the standard 
runtime library functions.  E.g.

void * __attribute__((tm_wrap(malloc)))
tm_malloc (size_t size)
{
  void *ret = malloc (size);
  if (ret)
    _ITM_addUserUndoAction (free, ret);
  return ret;
}

Anyway, this implements the tm_wrap attribute.


r~

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