rtlanal: Fix up replace_rtx [PR105333]

rtlanal: Fix up replace_rtx [PR105333]

The following testcase FAILs, because replace_rtx replaces a REG with
CONST_WIDE_INT inside of a SUBREG, which is an invalid transformation
because a SUBREG relies on SUBREG_REG having non-VOIDmode but
CONST_WIDE_INT has VOIDmode.

replace_rtx already has code to deal with it, but it was doing
it only for CONST_INTs.  The following patch does it also for
VOIDmode CONST_DOUBLE or CONST_WIDE_INT.

2022-04-22  Jakub Jelinek  <jakub@redhat.com>

	PR rtl-optimization/105333
	* rtlanal.cc (replace_rtx): Use simplify_subreg or
	simplify_unary_operation if CONST_SCALAR_INT_P rather than just
	CONST_INT_P.

	* gcc.dg/pr105333.c: New test.