Aligned bundling support. Following the discussion here:
http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-December/056754.html

The proposal and implementation are fully documented here:
https://sites.google.com/a/chromium.org/dev/nativeclient/pnacl/aligned-bundling-support-in-llvm

Tests will follow shortly.

llvm-svn: 170718
diff --git a/llvm/lib/MC/MCNullStreamer.cpp b/llvm/lib/MC/MCNullStreamer.cpp
index bb84c4f..d1cd006 100644
--- a/llvm/lib/MC/MCNullStreamer.cpp
+++ b/llvm/lib/MC/MCNullStreamer.cpp
@@ -95,6 +95,10 @@
                                        StringRef FileName) {}
     virtual void EmitInstruction(const MCInst &Inst) {}
 
+    virtual void EmitBundleAlignMode(unsigned AlignPow2) {}
+    virtual void EmitBundleLock() {}
+    virtual void EmitBundleUnlock() {}
+
     virtual void FinishImpl() {}
 
     virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {