search for: llvm_attribute_foo

I'd like to rename all of our macros to have LLVM_ or CLANG_ as a prefix (not sure if there are any where the latter is more appropriate, but I may find them). As LLVM and Clang are more and more widely used as libraries, these generic names have a high likelihood of collision with existing macros: http://google.com/codesearch?as_q=ATTRIBUTE_UNUSED I'm adding the new macros now, and if I