[Ada] Fix strange performance drop for code using SSE vector types

[Eric Botcazou]

Gigi generates a VIEW_CONVERT_EXPR in the middle of a hot loop, which kills 
the performance at run time.

Tested on x86_64-suse-linux, applied on the mainline.


2014-04-15  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/utils.c (type_for_vector_element_p): New predicate.
	(build_vector_type_for_size): New function.
	(build_vector_type_for_array): Likewise.
	(unchecked_convert): Build an intermediate vector type to convert
	from a generic array type to a vector type.
	(handle_vector_size_attribute): Reimplement.
	(handle_vector_type_attribute): Likewise.


2014-04-15  Eric Botcazou  <ebotcazou@adacore.com>

	* gnat.dg/vect14.adb: New test.


-- 
Eric Botcazou
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