Remove the assertion for now. This breaks lld.

lld has a hashtable with StringRef keys; it needs to iterate over the keys in
*insertion* order.  This is currently implemented as std::vector<StringRef> +
DenseMap<StringRef, T>.  This will probably need a proper
DenseMapInfo<StringRef> if we don't want to lose memory/performance by
migrating to a different data structure.

llvm-svn: 187868

include/llvm/ADT/DenseMap.h

@@ -606,9 +606,6 @@ public:
   }
 
   void init(unsigned InitBuckets) {
-    assert(!KeyInfoT::isEqual(this->getEmptyKey(), this->getTombstoneKey()) &&
-           "Bad implementation of KeyInfoT: empty key and tombstone key "
-           "should be different");
     if (allocateBuckets(InitBuckets)) {
       this->BaseT::initEmpty();
     } else {