Allow redefinition of libcilkrts debug macros

[Rainer Orth]

Hi Balaji,

> I suspected that much.  It would be good to have a libcilkrts/README.gcc
> describing the rules which changes can go into the gcc tree directly, which
> need to go upstream first, and how.  libo and libsanitizer already have
> this.
>
> Hi Rainer,
> 	It is mentioned under the "CONTRIBUTIONS" sections in the
> libcilkrts/README file :).

Sort of: it doesn't (and most likely shouldn't ) say anything about
if/when patches can first/exclusively go into the gcc tree.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University