Add basic YAML MC CFG testcase.

Drive-by llvm-objdump cleanup (don't hardcode ToolName).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188904 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-objdump/llvm-objdump.cpp b/tools/llvm-objdump/llvm-objdump.cpp
index a4cd6a2..8065787 100644
--- a/tools/llvm-objdump/llvm-objdump.cpp
+++ b/tools/llvm-objdump/llvm-objdump.cpp
@@ -374,7 +374,7 @@
       std::string Error;
       raw_fd_ostream YAMLOut(YAMLCFG.c_str(), Error);
       if (!Error.empty()) {
-        errs() << "llvm-objdump: warning: " << Error << '\n';
+        errs() << ToolName << ": warning: " << Error << '\n';
         return;
       }
       mcmodule2yaml(YAMLOut, *Mod, *MII, *MRI);