clang patch for -fno-var-tracking-assignments option

[martemyev]

Summary

The patch adds a new option '-fno-var-tracking-assignments' in the same group (clang_ignored_f_Group) where the existing '-fno-var-tracking' resides.

include/clang/Driver/Options.td

 def fuse_init_array : Flag<["-"], "fuse-init-array">, Group<f_Group>, Flags<[CC1Option]>,
   HelpText<"Use .init_array instead of .ctors">;
 def fno_var_tracking : Flag<["-"], "fno-var-tracking">, Group<clang_ignored_f_Group>;
+def fno_var_tracking_assignments : Flag<["-"], "fno-var-tracking-assignments">, Group<clang_ignored_f_Group>;
 def fverbose_asm : Flag<["-"], "fverbose-asm">, Group<f_Group>;
 def fvisibility_EQ : Joined<["-"], "fvisibility=">, Group<f_Group>,
   HelpText<"Set the default symbol visibility for all global declarations">, Values<"hidden,default">;