driver: add -mserialize-all pass-thru option for llc

include/clang/Driver/Options.td

@@ -1716,6 +1716,8 @@ def mpreemit_bitcode : Joined<["-"], "mpreemit-bitcode=">, Group<m_PML_Group>,
   HelpText<"Write the final bitcode representation (before emit) to FILE">, Flags<[HelpHidden]>;
 def mserialize : Joined<["-"], "mserialize=">, Group<m_PML_Group>,
   HelpText<"Export PML specification of generated machine code to FILE">, Flags<[HelpHidden]>;
+def mserialize_all : Flag<["-"], "mserialize-all">, Group<m_PML_Group>,
+  HelpText<"Export all methods into the PML specification">, Flags<[HelpHidden]>;
 def mserialize_roots : Joined<["-"], "mserialize-roots=">, Group<m_PML_Group>,
   HelpText<"Export only methods reachable from given functions">, Flags<[HelpHidden]>;