[PATCH][CodeGen] Add missing intrinsic lowering for sin, cos and ceil

[Duncan P. N. Exon Smith]

Huh, I'm surprised that IntrinsicLowering is only used in the interpreter.
I don't know `lli` too well, so anyone else should feel free to chime in
here.

I did notice that your test only checks the f32 versions -- I think it
should exercise the full matrix.

> On 2014-Aug-04, at 14:38, Josh Klontz <josh.klontz at gmail.com> wrote:
> 
> Duncan,
> 
> Attached is an updated patch with a test case. Note, this required extending lit to recognize `LLVM_ENABLE_FFI`.
> 
> v/r,
> Josh
> 
> 
> On Mon, Aug 4, 2014 at 2:02 PM, Duncan P. N. Exon Smith <dexonsmith at apple.com> wrote:
> Testcase?
> 
> > On 2014-Jul-30, at 05:00, Josh Klontz <josh.klontz at gmail.com> wrote:
> >
> > Ping. CC'ing code owner and release manager.
> > -Josh
> >
> >
> > On Wed, Jul 23, 2014 at 12:01 PM, Josh Klontz <josh.klontz at gmail.com> wrote:
> > This was discovered when trying to run lli on a function with an llvm.cos.f32 intrinsic. Hopefully this can get applied to the 3.5 branch as well. Thanks!
> > -Josh
> >
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> 
> 
> <patch.diff>