2013-03-21  Marc Glisse  <marc.glisse@inria.fr>

gcc/
	* tree.h (VECTOR_TYPE_P): New macro.
	(VECTOR_INTEGER_TYPE_P, VECTOR_FLOAT_TYPE_P, FLOAT_TYPE_P,
	TYPE_MODE): Use it.
	* fold-const.c (fold_cond_expr_with_comparison): Use build_zero_cst.
	VEC_COND_EXPR cannot be lvalues.
	(fold_ternary_loc) <VEC_COND_EXPR>: Merge with the COND_EXPR case.

gcc/cp/
	* call.c (build_conditional_expr_1): Fold VEC_COND_EXPR.

gcc/testsuite/
	* g++.dg/ext/vector21.C: New testcase.

From-SVN: r196884