Revert "IR: Use pointers instead of GUIDs to represent edges in the module summary. NFCI."

This reverts commit r302108. This causes crash in clang bootstrap with LTO.

Contacted the auther in the original commit.

llvm-svn: 302140
diff --git a/llvm/lib/IR/ModuleSummaryIndex.cpp b/llvm/lib/IR/ModuleSummaryIndex.cpp
index 9dd712f..01e1b81 100644
--- a/llvm/lib/IR/ModuleSummaryIndex.cpp
+++ b/llvm/lib/IR/ModuleSummaryIndex.cpp
@@ -22,7 +22,7 @@
     StringRef ModulePath, GVSummaryMapTy &GVSummaryMap) const {
   for (auto &GlobalList : *this) {
     auto GUID = GlobalList.first;
-    for (auto &GlobSummary : GlobalList.second.SummaryList) {
+    for (auto &GlobSummary : GlobalList.second) {
       auto *Summary = dyn_cast_or_null<FunctionSummary>(GlobSummary.get());
       if (!Summary)
         // Ignore global variable, focus on functions
@@ -40,7 +40,7 @@
     StringMap<GVSummaryMapTy> &ModuleToDefinedGVSummaries) const {
   for (auto &GlobalList : *this) {
     auto GUID = GlobalList.first;
-    for (auto &Summary : GlobalList.second.SummaryList) {
+    for (auto &Summary : GlobalList.second) {
       ModuleToDefinedGVSummaries[Summary->modulePath()][GUID] = Summary.get();
     }
   }
@@ -49,10 +49,10 @@
 GlobalValueSummary *
 ModuleSummaryIndex::getGlobalValueSummary(uint64_t ValueGUID,
                                           bool PerModuleIndex) const {
-  auto VI = getValueInfo(ValueGUID);
-  assert(VI && "GlobalValue not found in index");
-  assert((!PerModuleIndex || VI.getSummaryList().size() == 1) &&
+  auto SummaryList = findGlobalValueSummaryList(ValueGUID);
+  assert(SummaryList != end() && "GlobalValue not found in index");
+  assert((!PerModuleIndex || SummaryList->second.size() == 1) &&
          "Expected a single entry per global value in per-module index");
-  auto &Summary = VI.getSummaryList()[0];
+  auto &Summary = SummaryList->second[0];
   return Summary.get();
 }