Remove the explicit SDNodeIterator::operator= in favor of the implicit default

There doesn't seem to be any need to assert that iterator assignment is
between iterators over the same node - if you want to reuse an iterator
variable to iterate another node, that's perfectly acceptable. Just
don't mix comparisons between iterators into disjoint sequences, as
usual.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231135 91177308-0d34-0410-b5e6-96231b3b80d8

tools/llvm-diff/DiffLog.h

@@ -40,6 +40,8 @@ namespace llvm {
   public:
     LogBuilder(Consumer &c, StringRef Format)
       : consumer(c), Format(Format) {}
+    // Relying on RVO, not actually copyable.
+    LogBuilder(const LogBuilder&);
 
     LogBuilder &operator<<(Value *V) {
       Arguments.push_back(V);