Change the diagnostics interface to take an array of pointers to 
strings instead of array of strings.  This reduces string copying
in some not-very-important cases, but paves the way for future 
improvements.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@59494 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/Preprocessor.cpp b/lib/Lex/Preprocessor.cpp
index c65b546..dc4dd87 100644
--- a/lib/Lex/Preprocessor.cpp
+++ b/lib/Lex/Preprocessor.cpp
@@ -124,14 +124,16 @@
 
 void Preprocessor::Diag(SourceLocation Loc, unsigned DiagID, 
                         const std::string &Msg) {
-  Diags.Report(getFullLoc(Loc), DiagID, &Msg, 1);
+  const std::string *Strs[] = { &Msg };
+  Diags.Report(getFullLoc(Loc), DiagID, Strs, 1);
 }
 
 void Preprocessor::Diag(SourceLocation Loc, unsigned DiagID,
                         const std::string &Msg,
                         const SourceRange &R1, const SourceRange &R2) {
+  const std::string *Strs[] = { &Msg };
   SourceRange R[] = {R1, R2};
-  Diags.Report(getFullLoc(Loc), DiagID, &Msg, 1, R, 2);
+  Diags.Report(getFullLoc(Loc), DiagID, Strs, 1, R, 2);
 }