SemaTemplate - silence static analyzer getAs<> null dereference warnings. NFCI.

The static analyzer is warning about potential null dereferences, but we should be able to use castAs<> directly and if not assert will fire for us.

llvm-svn: 373827
diff --git a/clang/lib/Sema/SemaTemplate.cpp b/clang/lib/Sema/SemaTemplate.cpp
index 847a19b..62dc172 100644
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -5872,7 +5872,7 @@
     Expr *Arg, QualType ArgType) {
   bool ObjCLifetimeConversion;
   if (ParamType->isPointerType() &&
-      !ParamType->getAs<PointerType>()->getPointeeType()->isFunctionType() &&
+      !ParamType->castAs<PointerType>()->getPointeeType()->isFunctionType() &&
       S.IsQualificationConversion(ArgType, ParamType, false,
                                   ObjCLifetimeConversion)) {
     // For pointer-to-object types, qualification conversions are
@@ -6748,20 +6748,20 @@
       //    overloaded functions (or a pointer to such), the matching
       //    function is selected from the set (13.4).
       (ParamType->isPointerType() &&
-       ParamType->getAs<PointerType>()->getPointeeType()->isFunctionType()) ||
+       ParamType->castAs<PointerType>()->getPointeeType()->isFunctionType()) ||
       // -- For a non-type template-parameter of type reference to
       //    function, no conversions apply. If the template-argument
       //    represents a set of overloaded functions, the matching
       //    function is selected from the set (13.4).
       (ParamType->isReferenceType() &&
-       ParamType->getAs<ReferenceType>()->getPointeeType()->isFunctionType()) ||
+       ParamType->castAs<ReferenceType>()->getPointeeType()->isFunctionType()) ||
       // -- For a non-type template-parameter of type pointer to
       //    member function, no conversions apply. If the
       //    template-argument represents a set of overloaded member
       //    functions, the matching member function is selected from
       //    the set (13.4).
       (ParamType->isMemberPointerType() &&
-       ParamType->getAs<MemberPointerType>()->getPointeeType()
+       ParamType->castAs<MemberPointerType>()->getPointeeType()
          ->isFunctionType())) {
 
     if (Arg->getType() == Context.OverloadTy) {