Add target property for whether thread-local storage is supported.  
Let me know if I messed up for some target.  Note that for Windows, we 
should be able to support it (MSVC supports "__declspec(thread)"), but 
I'm pretty sure LLVM doesn't know how to generate the correct code.

llvm-svn: 69552
3 files changed
tree: d2f937e7ba99e0092d34b7d72fdcdda8250880c4
  1. clang/
  2. llvm/