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/lib/CodeGen/Mangle.cpp b/lib/CodeGen/Mangle.cpp
index 602c5f0..b240103 100644
--- a/lib/CodeGen/Mangle.cpp
+++ b/lib/CodeGen/Mangle.cpp
@@ -525,7 +525,7 @@
     Diagnostic &Diags = Context.getDiags();
     unsigned DiagID = Diags.getCustomDiagID(Diagnostic::Error,
                                       "cannot mangle dependent operator name");
-    Diags.Report(FullSourceLoc(), DiagID);
+    Diags.Report(DiagID);
     return;
   }
   
@@ -1672,9 +1672,7 @@
     Diagnostic &Diags = Context.getDiags();
     unsigned DiagID = Diags.getCustomDiagID(Diagnostic::Error,
                                      "cannot yet mangle expression type %0");
-    Diags.Report(FullSourceLoc(E->getExprLoc(),
-                               getASTContext().getSourceManager()),
-                 DiagID)
+    Diags.Report(E->getExprLoc(), DiagID)
       << E->getStmtClassName() << E->getSourceRange();
     break;
   }