r196372 - do not warn about unknown pragmas in modes that do not handle them (pr9537)

[Joerg Sonnenberger]

On Wed, Dec 04, 2013 at 10:21:41AM -0000, Lubos Lunak wrote:
> Author: llunak
> Date: Wed Dec  4 04:21:41 2013
> New Revision: 196372
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=196372&view=rev
> Log:
> do not warn about unknown pragmas in modes that do not handle them (pr9537)
> 
> And refactor to have just one place in code that sets up the empty
> pragma handlers.

Test case? Otherwise, thanks for looking at this. Bill -- is it harmless
enough to include in 3.4?

Joerg