Subzero: Add basic ELFObjectWriter (text section, symtab, strtab, headers)

src/IceTranslator.cpp

 //===- subzero/src/IceTranslator.cpp - ICE to machine code ------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines the general driver class for translating ICE to
@@ skipping 79 matching lines @@
         Func->emit();
       }
     }
     Ctx->dumpStats(Func->getFunctionName());
   }
 
   Ctx->setVerbose(OldVerboseMask);
 }
 
 void Translator::emitConstants() {
-  if (!Ctx->getFlags().DisableTranslation && Func)
-    Func->getTarget()->emitConstants();
+  if (!Ctx->getFlags().DisableTranslation && Func) {
+    if (Ctx->getFlags().UseELFWriter) {
+      // TODO(jvoung): create the rodata.cst.{4,8} sections for UseELFWriter.
+    } else {
+      Func->getTarget()->emitConstants();
+    }
+  }
 }
 
 void Translator::lowerGlobals(
     const VariableDeclarationListType &VariableDeclarations) {
   std::unique_ptr<TargetGlobalInitLowering> GlobalLowering(
       TargetGlobalInitLowering::createLowering(Ctx->getTargetArch(), Ctx));
   bool DisableTranslation = Ctx->getFlags().DisableTranslation;
   const bool DumpGlobalVariables =
       ALLOW_DUMP && Ctx->isVerbose() && Ctx->getFlags().VerboseFocusOn.empty();
   Ostream &Stream = Ctx->getStrDump();
   const IceString &TranslateOnly = Ctx->getFlags().TranslateOnly;
   for (const Ice::VariableDeclaration *Global : VariableDeclarations) {
     if (DumpGlobalVariables)
       Global->dump(getContext(), Stream);
     if (!DisableTranslation &&
         matchSymbolName(Global->getName(), TranslateOnly))
       GlobalLowering->lower(*Global);
   }
   GlobalLowering.reset();
 }