riscv: Use run-time endianess for floating point literals

gas/
	PR binutils/30551
	* config/tc-riscv.c (md_atof): Use target_big_endian instead of
	TARGET_BYTES_BIG_ENDIAN.
	* testsuite/gas/riscv/float-be.d: New file.
	* testsuite/gas/riscv/float-le.d: New file.
	* testsuite/gas/riscv/float.s: New file.
4 files changed