Add an alias option for -error-on-deserialized-decl with joined '='.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@143239 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/Driver/CC1Options.td b/include/clang/Driver/CC1Options.td
index 4b39d6e..7e61b6c 100644
--- a/include/clang/Driver/CC1Options.td
+++ b/include/clang/Driver/CC1Options.td
@@ -557,6 +557,8 @@
   HelpText<"Dump declarations that are deserialized from PCH, for testing">;
 def error_on_deserialized_pch_decl : Separate<"-error-on-deserialized-decl">,
   HelpText<"Emit error if a specific declaration is deserialized from PCH, for testing">;
+def error_on_deserialized_pch_decl_EQ : Joined<"-error-on-deserialized-decl=">,
+  Alias<error_on_deserialized_pch_decl>;
 def fshort_wchar : Flag<"-fshort-wchar">,
   HelpText<"Force wchar_t to be a short unsigned int">;
 def fshort_enums : Flag<"-fshort-enums">,