RISC-V: Also allow FP conditions in `riscv_expand_conditional_move'

RISC-V: Also allow FP conditions in `riscv_expand_conditional_move'

In `riscv_expand_conditional_move' we only let integer conditions
through at the moment, even though code has already been prepared to
handle floating-point conditions as well.

Lift this restriction and only bail out if a non-word-mode integer
condition has been requested, as we cannot handle this specific case
owing to machine instruction set restriction.  We already take care of
the non-integer, non-floating-point case later on.

	gcc/
	* config/riscv/riscv.cc (riscv_expand_conditional_move): Don't
	bail out in floating-point conditions.

(cherry picked from commit 37ff43c27344784caed28778fb847244a49644bd)