Debug Info: Move the constant for Debug Info Version from Dwarf.h to Metadata.h.

Suggested by Eric.
Paired commit with r196144.

llvm-svn: 196145

clang/lib/CodeGen/CodeGenModule.cpp

@@ -265,7 +265,7 @@ void CodeGenModule::Release() {
     // done, the bitcode linker is not going to see modules with different
     // version numbers.
     getModule().addModuleFlag(llvm::Module::Error, "Debug Info Version",
-                              llvm::dwarf::DEBUG_INFO_VERSION);
+                              llvm::DEBUG_METADATA_VERSION);
 
   SimplifyPersonality();