RISC-V: Bugfix for RVV floating-point rm suffix sequence

RISC-V: Bugfix for RVV floating-point rm suffix sequence

According to below RVV intrinsic doc, the RVV floating-point intrinsic name
with rounding mode should be:

_rm_m

instead of:

_m_rm

https://github.com/riscv-non-isa/rvv-intrinsic-doc/pull/226

This patch fix this naming sequence issue and adjust the test cases.

Signed-off-by: Pan Li <pan2.li@intel.com>
gcc/ChangeLog:

	* config/riscv/riscv-vector-builtins-shapes.cc (struct alu_frm_def):
	Move rm suffix before mask.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/base/float-point-frm-insert-1.c: Adjust
	test cases.
	* gcc.target/riscv/rvv/base/float-point-frm.c: Ditto.