[DebugInfo] Added support for Checksum debug info feature.

Differential Revision: https://reviews.llvm.org/D27642

llvm-svn: 290514
diff --git a/llvm/lib/IR/Verifier.cpp b/llvm/lib/IR/Verifier.cpp
index 9a19354..dc7f7bf 100644
--- a/llvm/lib/IR/Verifier.cpp
+++ b/llvm/lib/IR/Verifier.cpp
@@ -961,6 +961,8 @@
 
 void Verifier::visitDIFile(const DIFile &N) {
   AssertDI(N.getTag() == dwarf::DW_TAG_file_type, "invalid tag", &N);
+  AssertDI((N.getChecksumKind() != DIFile::CSK_None ||
+            N.getChecksum().empty()), "invalid checksum kind", &N);
 }
 
 void Verifier::visitDICompileUnit(const DICompileUnit &N) {