__uint128_t is indeed an unsigned integer type. Fixes PR5435.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@86561 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/Type.cpp b/lib/AST/Type.cpp
index e9ce830..ae78b89 100644
--- a/lib/AST/Type.cpp
+++ b/lib/AST/Type.cpp
@@ -425,7 +425,7 @@
 bool Type::isUnsignedIntegerType() const {
   if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType)) {
     return BT->getKind() >= BuiltinType::Bool &&
-           BT->getKind() <= BuiltinType::ULongLong;
+           BT->getKind() <= BuiltinType::UInt128;
   }
 
   if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType))