workaround for initialization order fiasco in llvm 7.0

For more information, see:
1. PR41367 (https://bugs.llvm.org/show_bug.cgi?id=41367)
2. llvm/llvm-project@c06a470#diff-a24105042657fab99820d2763969217c
3. llvm/llvm-project@46e5c5f#diff-a24105042657fab99820d2763969217c

Change-Id: I984fa1da0b1718ae0b4ee0b9c601d1ab69203caf

Author: aparshin-intel

releases/7.0.0/patches_external/initializaton_order_fiasco-workaround.patch

@@ -0,0 +1,53 @@
+#    Description                  : workaround for https://bugs.llvm.org/show_bug.cgi?id=41367
+#    When Fixed in Open Source    : Needed always
+#    Category                     : Bugfix
+diff --git a/include/llvm/Support/ManagedStatic.h b/include/llvm/Support/ManagedStatic.h
+index b4bf321..3166d59 100644
++++ b/include/llvm/Support/ManagedStatic.h
+--- a/include/llvm/Support/ManagedStatic.h
+@@ -17,6 +17,10 @@
+ #include <atomic>
+ #include <cstddef>
+ 
++#if !defined(_MSC_VER) || (_MSC_VER >= 1925) || defined(__clang__)
++#define LLVM_USE_CONSTEXPR_CTOR
++#endif
++
+ namespace llvm {
+ 
+ /// object_creator - Helper method for ManagedStatic.
+@@ -36,21 +40,33 @@ template <typename T, size_t N> struct object_deleter<T[N]> {
+ /// ManagedStaticBase - Common base class for ManagedStatic instances.
+ class ManagedStaticBase {
+ protected:
++#ifdef LLVM_USE_CONSTEXPR_CTOR
++  mutable std::atomic<void *> Ptr{};
++  mutable void (*DeleterFn)(void *) = nullptr;
++  mutable const ManagedStaticBase *Next = nullptr;
++#else
+   // This should only be used as a static variable, which guarantees that this
+   // will be zero initialized.
+   mutable std::atomic<void *> Ptr;
+   mutable void (*DeleterFn)(void*);
+   mutable const ManagedStaticBase *Next;
+-
++#endif
+   void RegisterManagedStatic(void *(*creator)(), void (*deleter)(void*)) const;
+ 
+ public:
++#ifdef LLVM_USE_CONSTEXPR_CTOR
++  constexpr ManagedStaticBase() = default;
++#endif
+   /// isConstructed - Return true if this object has not been created yet.
+   bool isConstructed() const { return Ptr != nullptr; }
+ 
+   void destroy() const;
+ };
+ 
++// we don't need LLVM_USE_CONSTEXPR_CTOR anymore as it is used only to define
++// a proper constructor and initializers
++#undef LLVM_USE_CONSTEXPR_CTOR
++
+ /// ManagedStatic - This transparently changes the behavior of global statics to
+ /// be lazily constructed on demand (good for reducing startup times of dynamic
+ /// libraries that link in LLVM components) and for making destruction be