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/tools/llvm-nm/llvm-nm.cpp b/tools/llvm-nm/llvm-nm.cpp
index a24aae6..683f99d 100644
--- a/tools/llvm-nm/llvm-nm.cpp
+++ b/tools/llvm-nm/llvm-nm.cpp
@@ -425,7 +425,7 @@
   cl::ParseCommandLineOptions(argc, argv, "llvm symbol table dumper\n");
 
   // llvm-nm only reads binary files.
-  if (error(sys::Program::ChangeStdinToBinary()))
+  if (error(sys::ChangeStdinToBinary()))
     return 1;
 
   ToolName = argv[0];