Fix exported varying bug & backwards compatibility.

module.cpp

@@ -1204,8 +1204,13 @@ lEmitStructDecl(const StructType *st, std::vector<const StructType *> *emittedSt
     for (int i = 0; i < st->GetElementCount(); ++i) {
         const Type *type = st->GetElementType(i)->GetAsNonConstType();
         std::string d = type->GetCDeclaration(st->GetElementName(i));
+        if (type->IsVaryingType()) {
+          fprintf(file, "    %s[%d];\n", d.c_str(), g->target->getVectorWidth());
+        }
+        else {
           fprintf(file, "    %s;\n", d.c_str());
         }
+    }
     fprintf(file, "};\n");
     fprintf(file, "#endif\n\n");
 }

type.cpp

@@ -1909,7 +1909,15 @@ StructType::StructType(const std::string &n, const llvm::SmallVector<const Type
 
 const std::string 
 StructType::GetCStructName() const {
+  // only return mangled name for varying structs for backwards
+  // compatibility...
+
+  if (variability == Variability::Varying) {
     return lMangleStructName(name, variability);
+  }
+  else {
+    return GetStructName();
+  }
 }
 
 Variability