[RFR] Create interface to call TSAN runtime

[Arthur Eubanks]

>
> My only nit would be that your file:
>
> http://cr.openjdk.java.net/~aeubanks/tsaninit/webrev.00/src/hotspot/share/runtime/tsanExternalDecls.hpp.html
>
> contains all the methods we use. Would we want to add into it
> incrementally instead? I'm indifferent both ways, just wondering :)
>
Hmm, I suppose it would make more sense to add them incrementally. Changed.
http://cr.openjdk.java.net/~aeubanks/tsaninit/webrev.01/