Subzero: Manage each Cfg as a std::unique_ptr<Cfg>.

src/IceTranslator.cpp

Index: src/IceTranslator.cpp
diff --git a/src/IceTranslator.cpp b/src/IceTranslator.cpp
index c05f58dc1151a4fec5010c1fc452d999061c53a6..e2bc5fcfd6e14399814a05b53c9a1f1b02a95bba 100644
--- a/src/IceTranslator.cpp
+++ b/src/IceTranslator.cpp
@@ -53,8 +53,9 @@ bool Translator::checkIfUnnamedNameSafe(const IceString &Name, const char *Kind,
   return false;
 }
 
-void Translator::translateFcn(Cfg *Func) {
-  Ctx->cfgQueueBlockingPush(Func);
+void Translator::translateFcn(std::unique_ptr<Cfg> Func) {
+  Cfg::updateTLS(nullptr);
+  Ctx->cfgQueueBlockingPush(Func.release());
   if (Ctx->getFlags().NumTranslationThreads == 0) {
     Ctx->translateFunctions();
   }