Fix Threading path when LLVM_ENABLE_THREADS=0.

llvm-svn: 296914
diff --git a/llvm/lib/Support/Threading.cpp b/llvm/lib/Support/Threading.cpp
index 2feb16e..e49d328 100644
--- a/llvm/lib/Support/Threading.cpp
+++ b/llvm/lib/Support/Threading.cpp
@@ -47,7 +47,7 @@
 
 unsigned llvm::heavyweight_hardware_concurrency() { return 1; }
 
-uint64_t llvm::get_threadid_np() { return 0; }
+uint64_t llvm::get_threadid() { return 0; }
 
 void llvm::set_thread_name(const Twine &Name) {}