Attempt to fix Orc JIT test timeouts

I think there are some destruction ordering issues here. The
ShouldDelete map seems to be getting destroyed before the shared_ptr
deleter lambda accesses it. In any case, this avoids inserting elements
into the map during shutdown.

llvm-svn: 306736

lib/ExecutionEngine/Orc/OrcMCJITReplacement.h

@@ -193,9 +193,9 @@ public:
     }
     auto *MPtr = M.release();
     ShouldDelete[MPtr] = true;
-    auto Deleter =
-      [this](Module *Mod) {
-        if (ShouldDelete[Mod])
+    auto Deleter = [this](Module *Mod) {
+      auto I = ShouldDelete.find(Mod);
+      if (I != ShouldDelete.end() && I->second)
         delete Mod;
     };
     LocalModules.push_back(std::shared_ptr<Module>(MPtr, std::move(Deleter)));