[PATCH] Allow builtin definition with -fno-builtin

[Francois Pichet]

Hi, I would like to propose this patch to makes it possible to compile any
builtin if -fno-builtin is passed.

Here is the problem I am trying to get around.

I am working on a out-of-tree target where atomic operations are expanded
to function calls.
for example:
  setOperationAction(ISD::ATOMIC_SWAP,  MVT::i32, Expand);


The backend will replace some atomic operations when compiling libc++ with
function calls. Now if I try to actually compile the function calls with
clang I'll get errors like:
       definition of builtin function '__sync_lock_test_and_set_4'

Just as if I was trying to compile a file similar to
http://www.opensource.apple.com/source/Libc/Libc-583/arm/sys/gcc_atomic.c with
clang.

Any objection? Or any possible workaround?
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