Remove the program class.

It was only used to implement ExecuteAndWait and ExecuteNoWait. Expose just
those two functions and make Execute and Wait implementations details.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183864 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/DataStream.cpp b/lib/Support/DataStream.cpp
index 0a02281..7815d08 100644
--- a/lib/Support/DataStream.cpp
+++ b/lib/Support/DataStream.cpp
@@ -66,7 +66,7 @@
   error_code OpenFile(const std::string &Filename) {
     if (Filename == "-") {
       Fd = 0;
-      sys::Program::ChangeStdinToBinary();
+      sys::ChangeStdinToBinary();
       return error_code::success();
     }