[-fms-extensions] Permit 'override' in C++98 and 'sealed' as a synonym for 'final'

Summary: Some MS headers use these features.

Reviewers: rnk, rsmith

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D1948

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@192936 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/PPMacroExpansion.cpp b/lib/Lex/PPMacroExpansion.cpp
index 9c998ea..f20633f 100644
--- a/lib/Lex/PPMacroExpansion.cpp
+++ b/lib/Lex/PPMacroExpansion.cpp
@@ -983,6 +983,7 @@
            .Case("is_standard_layout", LangOpts.CPlusPlus)
            .Case("is_pod", LangOpts.CPlusPlus)
            .Case("is_polymorphic", LangOpts.CPlusPlus)
+           .Case("is_sealed", LangOpts.MicrosoftExt)
            .Case("is_trivial", LangOpts.CPlusPlus)
            .Case("is_trivially_assignable", LangOpts.CPlusPlus)
            .Case("is_trivially_constructible", LangOpts.CPlusPlus)