Refactoring of Diagnostic class.

-Move the stuff of Diagnostic related to creating/querying diagnostic IDs into a new DiagnosticIDs class.
-DiagnosticIDs can be shared among multiple Diagnostics for multiple translation units.
-The rest of the state in Diagnostic object is considered related and tied to one translation unit.
-Have Diagnostic point to the SourceManager that is related with. Diagnostic can now accept just a
   SourceLocation instead of a FullSourceLoc.
-Reflect the changes to various interfaces.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@119730 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/driver/driver.cpp b/tools/driver/driver.cpp
index c117281..57765fe 100644
--- a/tools/driver/driver.cpp
+++ b/tools/driver/driver.cpp
@@ -288,7 +288,8 @@
   TextDiagnosticPrinter *DiagClient
     = new TextDiagnosticPrinter(llvm::errs(), DiagnosticOptions());
   DiagClient->setPrefix(Path.getBasename());
-  Diagnostic Diags(DiagClient);
+  llvm::IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
+  Diagnostic Diags(DiagID, DiagClient);
 
 #ifdef CLANG_IS_PRODUCTION
   const bool IsProduction = true;