Revert "Reapply "[DebugInfo][RemoveDIs] Turn on non-instrinsic debug-info by default""

This reverts commit 5c9f768.

Causes crashes, see comments on 5c9f768.

Author: aeubanks

llvm/lib/IR/BasicBlock.cpp

@@ -34,7 +34,7 @@ cl::opt<bool>
     UseNewDbgInfoFormat("experimental-debuginfo-iterators",
                         cl::desc("Enable communicating debuginfo positions "
                                  "through iterators, eliminating intrinsics"),
-                        cl::init(true));
+                        cl::init(false));
 
 DPMarker *BasicBlock::createMarker(Instruction *I) {
   assert(IsNewDbgInfoFormat &&