Revert [Bugpoint redesign] Added Pass to Remove Global Variables

This reverts r368918 because it was unstable!

It broke these builds:
 * http://lab.llvm.org:8011/builders/lld-x86_64-ubuntu-fast/builds/4649
 * http://lab.llvm.org:8011/builders/clang-ppc64be-linux-lnt/builds/29966
 * http://lab.llvm.org:8011/builders/clang-ppc64be-linux-lnt/builds/29964

But surprisingly this passed:
 * http://lab.llvm.org:8011/builders/clang-ppc64be-linux-lnt/builds/29965

llvm-svn: 369039

1 files changed, 0 insertions, 71 deletions

diff --git a/llvm/tools/llvm-reduce/deltas/ReduceGlobalVars.cpp b/llvm/tools/llvm-reduce/deltas/ReduceGlobalVars.cpp
deleted file mode 100644
index efe30c4ac3c..00000000000
--- a/llvm/tools/llvm-reduce/deltas/ReduceGlobalVars.cpp
+++ /dev/null
@@ -1,71 +0,0 @@
-//===- ReduceGlobalVars.cpp - Specialized Delta Pass ----------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements a function which calls the Generic Delta pass in order
-// to reduce initialized Global Variables in the provided Module.
-//
-//===----------------------------------------------------------------------===//
-
-#include "ReduceGlobalVars.h"
-
-/// Removes all the Initialized GVs that aren't inside the desired Chunks.
-static void extractGVsFromModule(std::vector<Chunk> ChunksToKeep,
-                                 Module *Program) {
-  // Get GVs inside desired chunks
-  std::set<GlobalVariable *> GVsToKeep;
-  unsigned I = 0, GVCount = 0;
-  for (auto &GV : Program->globals())
-    if (GV.hasInitializer() && I < ChunksToKeep.size()) {
-      if (ChunksToKeep[I].contains(++GVCount))
-        GVsToKeep.insert(&GV);
-      if (GVCount == ChunksToKeep[I].end)
-        ++I;
-    }
-
-  // Delete out-of-chunk GVs and their uses
-  std::vector<GlobalVariable *> ToRemove;
-  std::vector<Instruction *> InstToRemove;
-  for (auto &GV : Program->globals())
-    if (GV.hasInitializer() && !GVsToKeep.count(&GV)) {
-      for (auto U : GV.users())
-        if (auto *Inst = dyn_cast<Instruction>(U))
-          InstToRemove.push_back(Inst);
-
-      GV.replaceAllUsesWith(UndefValue::get(GV.getType()));
-      ToRemove.push_back(&GV);
-    }
-
-  // Delete Instruction uses of unwanted GVs
-  for (auto *Inst : InstToRemove) {
-    Inst->replaceAllUsesWith(UndefValue::get(Inst->getType()));
-    Inst->eraseFromParent();
-  }
-
-  for (auto *GV : ToRemove)
-    GV->eraseFromParent();
-}
-
-/// Counts the amount of initialized GVs and displays their
-/// respective name & index
-static int countGVs(Module *Program) {
-  // TODO: Silence index with --quiet flag
-  outs() << "----------------------------\n";
-  outs() << "GlobalVariable Index Reference:\n";
-  int GVCount = 0;
-  for (auto &GV : Program->globals())
-    if (GV.hasInitializer())
-      outs() << "\t" << ++GVCount << ": " << GV.getName() << "\n";
-  outs() << "----------------------------\n";
-  return GVCount;
-}
-
-void llvm::reduceGlobalsDeltaPass(TestRunner &Test) {
-  outs() << "*** Reducing GVs...\n";
-  unsigned GVCount = countGVs(Test.getProgram());
-  runDeltaPass(Test, GVCount, extractGVsFromModule);
-}