Revert "Try to appease MSVC on clang-x86-win2008-selfhost"

This reverts commit r272601. The attempt didn't work.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272602 91177308-0d34-0410-b5e6-96231b3b80d8

Author: chisophugis

include/llvm/Transforms/Scalar/JumpThreading.h

@@ -84,7 +84,6 @@ class JumpThreadingPass : public PassInfoMixin<JumpThreadingPass> {
 
 public:
   JumpThreadingPass(int T = -1);
-  JumpThreadingPass(const JumpThreadingPass &) = delete;
 
   // Glue for old PM.
   bool runImpl(Function &F, TargetLibraryInfo *TLI_, LazyValueInfo *LVI_,