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	chains for 2 VECTOR_CSTs are not the same length.

	PR regression/21897
	* fold-const.c (fold_ternary) <case BIT_FIELD_REF>: Don't crash if
	not all VECTOR_CST elements are given.

	* gcc.c-torture/execute/20050604-1.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@100674 138bc75d-0d04-0410-961f-82ee72b054a4