Make helpers static. Add missing include so LLVMInitializeObjCARCOpts gets C linkage.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175264 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCObjectStreamer.cpp b/lib/MC/MCObjectStreamer.cpp
index 5aa4b40..fe43506 100644
--- a/lib/MC/MCObjectStreamer.cpp
+++ b/lib/MC/MCObjectStreamer.cpp
@@ -224,7 +224,7 @@
   IF->getContents().append(Code.begin(), Code.end());
 }
 
-const char *BundlingNotImplementedMsg =
+static const char *BundlingNotImplementedMsg =
   "Aligned bundling is not implemented for this object format";
 
 void MCObjectStreamer::EmitBundleAlignMode(unsigned AlignPow2) {