Use reference instead of copy.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190813 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/ShrinkWrapping.cpp b/lib/CodeGen/ShrinkWrapping.cpp
index 6c826de..2b01fdd 100644
--- a/lib/CodeGen/ShrinkWrapping.cpp
+++ b/lib/CodeGen/ShrinkWrapping.cpp
@@ -357,7 +357,7 @@
 ///
 bool PEI::calculateSets(MachineFunction &Fn) {
   // Sets used to compute spill, restore placement sets.
-  const std::vector<CalleeSavedInfo> CSI =
+  const std::vector<CalleeSavedInfo> &CSI =
     Fn.getFrameInfo()->getCalleeSavedInfo();
 
   // If no CSRs used, we are done.
@@ -1054,7 +1054,7 @@
 
 std::string PEI::stringifyCSRegSet(const CSRegSet& s) {
   const TargetRegisterInfo* TRI = MF->getTarget().getRegisterInfo();
-  const std::vector<CalleeSavedInfo> CSI =
+  const std::vector<CalleeSavedInfo> &CSI =
     MF->getFrameInfo()->getCalleeSavedInfo();
 
   std::ostringstream srep;
diff --git a/lib/MC/MCParser/AsmParser.cpp b/lib/MC/MCParser/AsmParser.cpp
index ae88a3e..2733f64 100644
--- a/lib/MC/MCParser/AsmParser.cpp
+++ b/lib/MC/MCParser/AsmParser.cpp
@@ -1646,7 +1646,7 @@
   // Use the CppHashFilename and calculate a line number based on the
   // CppHashLoc and CppHashLineNumber relative to this Diag's SMLoc for
   // the diagnostic.
-  const std::string Filename = Parser->CppHashFilename;
+  const std::string &Filename = Parser->CppHashFilename;
 
   int DiagLocLineNo = DiagSrcMgr.FindLineNumber(DiagLoc, DiagBuf);
   int CppHashLocLineNo =