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

src/IceTranslator.cpp

Index: src/IceTranslator.cpp
diff --git a/src/IceTranslator.cpp b/src/IceTranslator.cpp
index 2a50a410c90a0db122a87e32ca846d51b5df8d30..a6acfb545e57f77891f6bc0e743444981ad04870 100644
--- a/src/IceTranslator.cpp
+++ b/src/IceTranslator.cpp
@@ -97,8 +97,13 @@ void Translator::translateFcn(Cfg *Fcn) {
 }
 
 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(