Remove unnecessary copying or replace it with moves in a bunch of places.

NFC.

llvm-svn: 219061
diff --git a/llvm/lib/DebugInfo/DWARFDebugAbbrev.cpp b/llvm/lib/DebugInfo/DWARFDebugAbbrev.cpp
index 8426bf9..c1a088e 100644
--- a/llvm/lib/DebugInfo/DWARFDebugAbbrev.cpp
+++ b/llvm/lib/DebugInfo/DWARFDebugAbbrev.cpp
@@ -30,7 +30,6 @@
   DWARFAbbreviationDeclaration AbbrDecl;
   uint32_t PrevAbbrCode = 0;
   while (AbbrDecl.extract(Data, OffsetPtr)) {
-    Decls.push_back(AbbrDecl);
     if (FirstAbbrCode == 0) {
       FirstAbbrCode = AbbrDecl.getCode();
     } else {
@@ -40,6 +39,7 @@
       }
     }
     PrevAbbrCode = AbbrDecl.getCode();
+    Decls.push_back(std::move(AbbrDecl));
   }
   return BeginOffset != *OffsetPtr;
 }
@@ -82,7 +82,7 @@
     uint32_t CUAbbrOffset = Offset;
     if (!AbbrDecls.extract(Data, &Offset))
       break;
-    AbbrDeclSets[CUAbbrOffset] = AbbrDecls;
+    AbbrDeclSets[CUAbbrOffset] = std::move(AbbrDecls);
   }
 }
 
diff --git a/llvm/lib/DebugInfo/DWARFDebugFrame.cpp b/llvm/lib/DebugInfo/DWARFDebugFrame.cpp
index a33548e..dfa7e82 100644
--- a/llvm/lib/DebugInfo/DWARFDebugFrame.cpp
+++ b/llvm/lib/DebugInfo/DWARFDebugFrame.cpp
@@ -202,7 +202,8 @@
       SmallString<8> Augmentation, uint64_t CodeAlignmentFactor,
       int64_t DataAlignmentFactor, uint64_t ReturnAddressRegister)
       : FrameEntry(FK_CIE, Offset, Length), Version(Version),
-        Augmentation(Augmentation), CodeAlignmentFactor(CodeAlignmentFactor),
+        Augmentation(std::move(Augmentation)),
+        CodeAlignmentFactor(CodeAlignmentFactor),
         DataAlignmentFactor(DataAlignmentFactor),
         ReturnAddressRegister(ReturnAddressRegister) {}