introduce a new TargetLibraryInfo pass, which transformations can use to

query about available library functions.  For now this just has 
memset_pattern16, which exists on darwin, but it can be extended for a 
bunch of other things in the future.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125965 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Target.cpp

@@ -24,6 +24,7 @@ using namespace llvm;
 
 void llvm::initializeTarget(PassRegistry &Registry) {
   initializeTargetDataPass(Registry);
+  initializeTargetLibraryInfoPass(Registry);
 }
 
 void LLVMInitializeTarget(LLVMPassRegistryRef R) {