RISC-V: revert pr114194 tests on gcc-14 [PR118601]

RISC-V: revert pr114194 tests on gcc-14 [PR118601]

The gcc-14 backport that split the pr114194 testcase for rv32 and rv64
would only generate the expected rv32 sequence if commit
6b315907c0353f71169a7555e653d29a981fef67 had also been backported, but
it wasn't.  Without it, we get the same code as before on both rv32
and rv64, so revert to the original test.

for  gcc/testsuite/ChangeLog

	PR target/118601
	* gcc.target/riscv/rvv/xtheadvector/pr114194.c: Restore.
	* gcc.target/riscv/rvv/xtheadvector/pr114194-rv64.c: Remove.
	* gcc.target/riscv/rvv/xtheadvector/pr114194-rv32.c: Likewise.