[ThinLTO] Refactor some common code into getGlobalValueInfo method (NFC)

Refactor common code that queries the ModuleSummaryIndex for a value's
GlobalValueInfo struct into getGlobalValueInfo helper methods, which
will also be used by D18763.

llvm-svn: 265370
diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index 09e5220..39f2d6a 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -5824,12 +5824,7 @@
                              CalleeInfo(CallsiteCount, ProfileCount));
       }
       GlobalValue::GUID GUID = getGUIDFromValueId(ValueID);
-      auto InfoList = TheIndex->findGlobalValueInfoList(GUID);
-      assert(InfoList != TheIndex->end() &&
-             "Expected VST parse to create GlobalValueInfo entry");
-      assert(InfoList->second.size() == 1 &&
-             "Expected a single GlobalValueInfo per GUID in module");
-      auto &Info = InfoList->second[0];
+      auto *Info = TheIndex->getGlobalValueInfo(GUID);
       assert(!Info->summary() && "Expected a single summary per VST entry");
       Info->setSummary(std::move(FS));
       break;
@@ -5848,12 +5843,7 @@
         FS->addRefEdge(RefGUID);
       }
       GlobalValue::GUID GUID = getGUIDFromValueId(ValueID);
-      auto InfoList = TheIndex->findGlobalValueInfoList(GUID);
-      assert(InfoList != TheIndex->end() &&
-             "Expected VST parse to create GlobalValueInfo entry");
-      assert(InfoList->second.size() == 1 &&
-             "Expected a single GlobalValueInfo per GUID in module");
-      auto &Info = InfoList->second[0];
+      auto *Info = TheIndex->getGlobalValueInfo(GUID);
       assert(!Info->summary() && "Expected a single summary per VST entry");
       Info->setSummary(std::move(FS));
       break;