gcc/
	* config/riscv/riscv.md (f<quiet_pattern>_quiet<ANYF:mode><X:mode>4):
	Add define_expand.  Add ! HONOR_SNANS check to current pattern.  Add
	new pattern using HONOR_SNANS that emits one extra instruction.

Co-Authored-By: Jim Wilson <jimw@sifive.com>

From-SVN: r264892