Driver: Skip the -ivfsoverlay argument in driver crash diags

llvm-svn: 211474
diff --git a/clang/lib/Driver/Job.cpp b/clang/lib/Driver/Job.cpp
index 38f68eb..42cc1bc 100644
--- a/clang/lib/Driver/Job.cpp
+++ b/clang/lib/Driver/Job.cpp
@@ -41,7 +41,7 @@
     .Cases("-internal-externc-isystem", "-iprefix", "-iwithprefix", true)
     .Cases("-iwithprefixbefore", "-isysroot", "-isystem", "-iquote", true)
     .Cases("-resource-dir", "-serialize-diagnostic-file", true)
-    .Case("-dwarf-debug-flags", true)
+    .Cases("-dwarf-debug-flags", "-ivfsoverlay", true)
     .Default(false);
 
   // Match found.