RISC-V: Adjust vx combine test case to avoid name conflict

RISC-V: Adjust vx combine test case to avoid name conflict

Given we will put all vx combine for int8 in a single file,
we need to make sure the generate function for different
types and ops has different function name.  Thus, refactor
the test helper macros for avoiding possible function name
conflict.

The below test suites are passed for this patch series.
* The rv64gcv fully regression test.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/autovec/vx_vf/vx-1-i16.c: Add
	type and op name to generate test function name.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-1-i32.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-1-i64.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-1-i8.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-1-u16.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-1-u32.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-1-u64.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-1-u8.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-2-i16.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-2-i32.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-2-i64.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-2-i8.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-2-u16.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-2-u32.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-2-u64.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-2-u8.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-3-i16.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-3-i32.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-3-i64.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-3-i8.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-3-u16.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-3-u32.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-3-u64.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-3-u8.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-4-i16.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-4-i32.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-4-i64.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-4-i8.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-4-u16.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-4-u32.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-4-u64.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-4-u8.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-5-i16.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-5-i32.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-5-i64.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-5-i8.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-5-u16.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-5-u32.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-5-u64.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-5-u8.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-6-i16.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-6-i32.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-6-i64.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-6-i8.c: Ditto
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-6-u16.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-6-u32.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-6-u64.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx-6-u8.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx_vadd-run-1-i16.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx_vadd-run-1-i32.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx_vadd-run-1-i64.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx_vadd-run-1-i8.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx_vadd-run-1-u16.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx_vadd-run-1-u32.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx_vadd-run-1-u64.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx_vadd-run-1-u8.c: Ditto.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx_binary.h: Refine the
	test helper macros to avoid conflict.
	* gcc.target/riscv/rvv/autovec/vx_vf/vx_binary_run.h: Ditto.

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