rs6000: Don't ICE when compiling the __builtin_vsx_splat_2di [PR113950]

rs6000: Don't ICE when compiling the __builtin_vsx_splat_2di [PR113950]

When we expand the __builtin_vsx_splat_2di built-in, we were allowing immediate
value for second operand which causes an unrecognizable insn ICE. Even though
the immediate value was forced into a register, it wasn't correctly assigned
to the second operand. So corrected the assignment of op1 to operands[1].

2024-03-07  Jeevitha Palanisamy  <jeevitha@linux.ibm.com>

gcc/
	PR target/113950
	* config/rs6000/vsx.md (vsx_splat_<mode>): Correct assignment to operand1
	and simplify else if with else.

gcc/testsuite/
	PR target/113950
	* gcc.target/powerpc/pr113950.c: New testcase.

(cherry picked from commit fa0468877869f52b05742de6deef582e4dd296fc)