[DWARFv5] Have -gdwarf-5 generate MD5 checksums

Differential Revision: https://reviews.llvm.org/D42011

llvm-svn: 322413
diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index cb15c76..d29e079 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -365,7 +365,8 @@
 CGDebugInfo::computeChecksum(FileID FID, SmallString<32> &Checksum) const {
   Checksum.clear();
 
-  if (!CGM.getCodeGenOpts().EmitCodeView)
+  if (!CGM.getCodeGenOpts().EmitCodeView &&
+      CGM.getCodeGenOpts().DwarfVersion < 5)
     return llvm::DIFile::CSK_None;
 
   SourceManager &SM = CGM.getContext().getSourceManager();