[PATCH,c++] use a VEC in typeck2.c:build_x_arrow

[Mark Mitchell]

Nathan Froyd wrote:
> The patch below converts build_x_arrow to use a VEC rather than a
> TREE_LIST for the types_memoized variable.  I hope the number of types
> this function is expected to encounter is small...

Yeah...  But, even if O(N) == O(N), your patch sure should help with the
constant factor.

> 	* typeck2.c (build_x_arrow): Make types_memoized a VEC.

OK.

-- 
Mark Mitchell
CodeSourcery
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