[PATCH] Begin implementing Plan 9 C extensions.

[Arthur O'Dwyer]

================
Comment at: lib/Sema/SemaDecl.cpp:1772
@@ -1771,3 +1771,3 @@
 
-  // Modules always permit redefinition of typedefs, as does C11.
-  if (getLangOpts().Modules || getLangOpts().C11)
+  // Modules always permit redefinition of typedefs, as does C11 and Plan 9.
+  if (getLangOpts().Modules || getLangOpts().C11 || getLangOpts().Plan9Ext)
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"as **do** C11 and Plan 9"

http://reviews.llvm.org/D3853