Subzero: Fixed deadlock with _start but no globals

src/IceASanInstrumentation.h

Index: src/IceASanInstrumentation.h
diff --git a/src/IceASanInstrumentation.h b/src/IceASanInstrumentation.h
index c9095fa525e1870265e6e74dce8dc4cf32be7aae..bd889592e664a7caeecf6ced1c31a7a497364f49 100644
--- a/src/IceASanInstrumentation.h
+++ b/src/IceASanInstrumentation.h
@@ -33,9 +33,7 @@ class ASanInstrumentation : public Instrumentation {
   ASanInstrumentation &operator=(const ASanInstrumentation &) = delete;
 
 public:
-  ASanInstrumentation(GlobalContext *Ctx)
-      : Instrumentation(Ctx), RzNum(0),
-        GlobalsLock(GlobalsMutex, std::defer_lock) {
+  ASanInstrumentation(GlobalContext *Ctx) : Instrumentation(Ctx), RzNum(0) {
     ICE_TLS_INIT_FIELD(LocalDtors);
   }
   void instrumentGlobals(VariableDeclarationList &Globals) override;
@@ -57,8 +55,6 @@ private:
   bool DidProcessGlobals = false;
   SizeT RzGlobalsNum = 0;
   std::mutex GlobalsMutex;
-  std::unique_lock<std::mutex> GlobalsLock;
-  std::condition_variable GlobalsDoneCV;
 };
 } // end of namespace Ice