Fix symbol sorting

Author: sfackler

src/librustc_span/symbol.rs

@@ -347,6 +347,7 @@ symbols! {
         generators,
         generic_associated_types,
         generic_param_attrs,
+        get_context,
         global_allocator,
         global_asm,
         globs,
@@ -548,7 +549,6 @@ symbols! {
         plugins,
         poll,
         Poll,
-        get_context,
         powerpc_target_feature,
         precise_pointer_size_matching,
         pref_align_of,