[C++ Patch, committed] Fix typo in comment

[Paolo Carlini]

Hi,

noticed a while ago, fix just committed.

Thanks, Paolo.

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2017-12-19  Paolo Carlini  <paolo.carl...@oracle.com>

        * cp-tree.h: Fix typo in comment.

Index: cp-tree.h
===================================================================
--- cp-tree.h   (revision 255814)
+++ cp-tree.h   (working copy)
@@ -404,7 +404,7 @@ extern GTY(()) tree cp_global_trees[CPTI_MAX];
       DECL_NON_TRIVIALLY_INITIALIZED_P (in VAR_DECL)
       CALL_EXPR_ORDERED_ARGS (in CALL_EXPR, AGGR_INIT_EXPR)
       DECLTYPE_FOR_REF_CAPTURE (in DECLTYPE_TYPE)
-      CONSTUCTOR_C99_COMPOUND_LITERAL (in CONSTRUCTOR)
+      CONSTRUCTOR_C99_COMPOUND_LITERAL (in CONSTRUCTOR)
       OVL_NESTED_P (in OVERLOAD)
    4: IDENTIFIER_MARKED (IDENTIFIER_NODEs)
       TREE_HAS_CONSTRUCTOR (in INDIRECT_REF, SAVE_EXPR, CONSTRUCTOR,