[NFC] Modernize enum Declarator::TheContext to a type-safe scoped enum.

Note, we don't do any bitwise manipulations when using them.

llvm-svn: 321546
diff --git a/clang/lib/Sema/SemaCodeComplete.cpp b/clang/lib/Sema/SemaCodeComplete.cpp
index 9aed178..2acc896 100644
--- a/clang/lib/Sema/SemaCodeComplete.cpp
+++ b/clang/lib/Sema/SemaCodeComplete.cpp
@@ -4171,8 +4171,8 @@
   AddTypeQualifierResults(DS, Results, LangOpts);
   if (LangOpts.CPlusPlus11) {
     Results.AddResult("noexcept");
-    if (D.getContext() == Declarator::MemberContext && !D.isCtorOrDtor() &&
-        !D.isStaticMember()) {
+    if (D.getContext() == DeclaratorContext::MemberContext &&
+        !D.isCtorOrDtor() && !D.isStaticMember()) {
       if (!VS || !VS->isFinalSpecified())
         Results.AddResult("final");
       if (!VS || !VS->isOverrideSpecified())