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

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

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@373480 91177308-0d34-0410-b5e6-96231b3b80d8

lib/AST/Type.cpp

@@ -75,11 +75,11 @@ const IdentifierInfo* QualType::getBaseTypeIdentifier() const {
   if (ty->isPointerType() || ty->isReferenceType())
     return ty->getPointeeType().getBaseTypeIdentifier();
   else if (ty->isRecordType())
-    ND = ty->getAs<RecordType>()->getDecl();
+    ND = ty->castAs<RecordType>()->getDecl();
   else if (ty->isEnumeralType())
-    ND = ty->getAs<EnumType>()->getDecl();
+    ND = ty->castAs<EnumType>()->getDecl();
   else if (ty->getTypeClass() == Type::Typedef)
-    ND = ty->getAs<TypedefType>()->getDecl();
+    ND = ty->castAs<TypedefType>()->getDecl();
   else if (ty->isArrayType())
     return ty->castAsArrayTypeUnsafe()->
         getElementType().getBaseTypeIdentifier();