re PR c/66066 (r222889 causes bogus error: initializer element is not constant)

re PR c/66066 (r222889 causes bogus error: initializer element is not constant)

	PR c/66066
	PR c/66127
	* c-common.c (c_fully_fold): Pass false down to c_fully_fold_internal.
	(c_fully_fold_internal): Fold C_MAYBE_CONST_EXPRs with
	C_MAYBE_CONST_EXPR_INT_OPERANDS set.  Add FOR_INT_CONST argument and
	use it.  If FOR_INT_CONST, require that all evaluated operands be
	INTEGER_CSTs.

	* c-typeck.c (digest_init): Call pedwarn_init with OPT_Wpedantic
	rather than with 0.

	* gcc.dg/pr14649-1.c: Add -Wpedantic.
	* gcc.dg/pr19984.c: Likewise.
	* gcc.dg/pr66066-1.c: New test.
	* gcc.dg/pr66066-2.c: New test.
	* gcc.dg/pr66066-3.c: New test.

From-SVN: r223193