Implement checking of exception spec compatibility for overriding virtual functions.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@74943 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 85210f0..290ab5d 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -2244,7 +2244,8 @@
       for (BasePaths::decl_iterator I = Paths.found_decls_begin(), 
            E = Paths.found_decls_end(); I != E; ++I) {
         if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) {
-          if (!CheckOverridingFunctionReturnType(NewMD, OldMD))
+          if (!CheckOverridingFunctionReturnType(NewMD, OldMD) &&
+              !CheckOverridingFunctionExceptionSpec(NewMD, OldMD))
             NewMD->addOverriddenMethod(OldMD);
         }
       }