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/Target/SystemZ/MCTargetDesc/SystemZMCTargetDesc.cpp b/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCTargetDesc.cpp
index 19b2bcb..9e1296b 100644
--- a/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCTargetDesc.cpp
+++ b/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCTargetDesc.cpp
@@ -187,7 +187,7 @@
                                                  MCCodeEmitter *Emitter,
                                                  bool RelaxAll,
                                                  bool NoExecStack) {
-  return createELFStreamer(Ctx, MAB, OS, Emitter, RelaxAll, NoExecStack);
+  return createELFStreamer(Ctx, 0, MAB, OS, Emitter, RelaxAll, NoExecStack);
 }
 
 extern "C" void LLVMInitializeSystemZTargetMC() {