Add a MCTargetStreamer interface.

This patch fixes an old FIXME by creating a MCTargetStreamer interface
and moving the target specific functions for ARM, Mips and PPC to it.

The ARM streamer is still declared in a common place because it is
used from lib/CodeGen/ARMException.cpp, but the Mips and PPC are
completely hidden in the corresponding Target directories.

I will send an email to llvmdev with instructions on how to use this.

llvm-svn: 192181
diff --git a/llvm/lib/LTO/LTOModule.cpp b/llvm/lib/LTO/LTOModule.cpp
index 207e85c..98c5416 100644
--- a/llvm/lib/LTO/LTOModule.cpp
+++ b/llvm/lib/LTO/LTOModule.cpp
@@ -591,7 +591,7 @@
       return Symbols.end();
     }
 
-    RecordStreamer(MCContext &Context) : MCStreamer(Context) {}
+    RecordStreamer(MCContext &Context) : MCStreamer(Context, 0) {}
 
     virtual void EmitInstruction(const MCInst &Inst) {
       // Scan for values.