Convert a few expression actions to smart pointers.
These actions are extremely widely used (identifier expressions and literals); still no performance regression.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@62468 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaExprCXX.cpp b/lib/Sema/SemaExprCXX.cpp
index ba502ec..09db18e 100644
--- a/lib/Sema/SemaExprCXX.cpp
+++ b/lib/Sema/SemaExprCXX.cpp
@@ -26,7 +26,7 @@
 /// very similar to ActOnIdentifierExpr, except that instead of
 /// providing an identifier the parser provides the type of the
 /// conversion function.
-Sema::ExprResult 
+Sema::OwningExprResult
 Sema::ActOnCXXConversionFunctionExpr(Scope *S, SourceLocation OperatorLoc,
                                      TypeTy *Ty, bool HasTrailingLParen,
                                      const CXXScopeSpec &SS) {
@@ -34,7 +34,7 @@
   QualType ConvTypeCanon = Context.getCanonicalType(ConvType);
   DeclarationName ConvName 
     = Context.DeclarationNames.getCXXConversionFunctionName(ConvTypeCanon);
-  return ActOnDeclarationNameExpr(S, OperatorLoc, ConvName, HasTrailingLParen, 
+  return ActOnDeclarationNameExpr(S, OperatorLoc, ConvName, HasTrailingLParen,
                                   &SS);
 }
 
@@ -43,7 +43,7 @@
 /// similar to ActOnIdentifierExpr, except that instead of providing
 /// an identifier the parser provides the kind of overloaded
 /// operator that was parsed.
-Sema::ExprResult 
+Sema::OwningExprResult
 Sema::ActOnCXXOperatorFunctionIdExpr(Scope *S, SourceLocation OperatorLoc,
                                      OverloadedOperatorKind Op,
                                      bool HasTrailingLParen,