Index: ./lib/IR/Verifier.cpp      
===================================================================
--- ./lib/IR/Verifier.cpp      
+++ ./lib/IR/Verifier.cpp      
@@ -871,7 +871,8 @@
 
 void Verifier::visitDIBasicType(const DIBasicType &N) {
   AssertDI(N.getTag() == dwarf::DW_TAG_base_type ||
-               N.getTag() == dwarf::DW_TAG_unspecified_type,
+               N.getTag() == dwarf::DW_TAG_unspecified_type ||
+               N.getTag() == dwarf::DW_TAG_string_type,
            "invalid tag", &N);
 }