Convert Constant->emit() definitions to allow multiple targets to define them.

src/IceTargetLowering.cpp

 //===- subzero/src/IceTargetLowering.cpp - Basic lowering implementation --===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the skeleton of the TargetLowering class,
@@ skipping 216 matching lines @@
 
 InstCall *TargetLowering::makeHelperCall(const IceString &Name, Variable *Dest,
                                          SizeT MaxSrcs) {
   const bool HasTailCall = false;
   Constant *CallTarget = Ctx->getConstantExternSym(Name);
   InstCall *Call =
       InstCall::create(Func, MaxSrcs, Dest, CallTarget, HasTailCall);
   return Call;
 }
 
+void TargetLowering::emitWithoutPrefix(const ConstantRelocatable *C) const {
+  if (!ALLOW_DUMP)
+    return;
+  Ostream &Str = Ctx->getStrEmit();
+  if (C->getSuppressMangling())
+    Str << C->getName();
+  else
+    Str << Ctx->mangleName(C->getName());
+  RelocOffsetT Offset = C->getOffset();
+  if (Offset) {
+    if (Offset > 0)
+      Str << "+";
+    Str << Offset;
+  }
+}
+
+void TargetLowering::emit(const ConstantRelocatable *C) const {
+  if (!ALLOW_DUMP)
+    return;
+  Ostream &Str = Ctx->getStrEmit();
+  Str << getConstantPrefix();
+  emitWithoutPrefix(C);
+}
+
 std::unique_ptr<TargetDataLowering>
 TargetDataLowering::createLowering(GlobalContext *Ctx) {
   TargetArch Target = Ctx->getFlags().getTargetArch();
 #define SUBZERO_TARGET(X)                                                      \
   if (Target == Target_##X)                                                    \
     return std::unique_ptr<TargetDataLowering>(TargetData##X::create(Ctx));
 #include "llvm/Config/SZTargets.def"
 
   llvm_unreachable("Unsupported target data lowering");
   return nullptr;
 }
 
 TargetDataLowering::~TargetDataLowering() {}
 
 } // end of namespace Ice