Collect lang items after expansion

This allows macros to create lang items.

gcc/rust/ChangeLog:

	* rust-session-manager.cc (Session::compile_crate): Collect lang
	items after expansion.

Signed-off-by: Owen Avery <[email protected]>

Author: powerboat9

gcc/rust/rust-session-manager.cc

@@ -612,13 +612,13 @@ Session::compile_crate (const char *filename)
   if (last_step == CompileOptions::CompileStep::Expansion)
     return;
 
-  AST::CollectLangItems ().go (parsed_crate);
-
   auto name_resolution_ctx = Resolver2_0::NameResolutionContext ();
   // expansion pipeline stage
 
   expansion (parsed_crate, name_resolution_ctx);
 
+  AST::CollectLangItems ().go (parsed_crate);
+
   rust_debug ("\033[0;31mSUCCESSFULLY FINISHED EXPANSION \033[0m");
   if (options.dump_option_enabled (CompileOptions::EXPANSION_DUMP))
     {