File llvm-drop-llvm-optional-clang-specific-optimization.patch of Package llvm7.15177

Subject: [ADT] Drop llvm::Optional clang-specific optmization for trivially copyable…
References: boo#1119092 https://reviews.llvm.org/rL346985

Index: llvm/include/llvm/ADT/Optional.h
===================================================================
--- llvm/include/llvm/ADT/Optional.h	(revision 346984)
+++ llvm/include/llvm/ADT/Optional.h	(revision 346985)
@@ -108,24 +108,6 @@
   }
 };
 
-#if !defined(__GNUC__) || defined(__clang__) // GCC up to GCC7 miscompiles this.
-/// Storage for trivially copyable types only.
-template <typename T> struct OptionalStorage<T, true> {
-  AlignedCharArrayUnion<T> storage;
-  bool hasVal = false;
-
-  OptionalStorage() = default;
-
-  OptionalStorage(const T &y) : hasVal(true) { new (storage.buffer) T(y); }
-  OptionalStorage &operator=(const T &y) {
-    *reinterpret_cast<T *>(storage.buffer) = y;
-    hasVal = true;
-    return *this;
-  }
-
-  void reset() { hasVal = false; }
-};
-#endif
 } // namespace optional_detail
 
 template <typename T> class Optional {