bpf: correct bpf_print_operand for floats [PR108293]

bpf: correct bpf_print_operand for floats [PR108293]

The existing logic in bpf_print_operand was only correct for integral
CONST_DOUBLEs, and emitted garbage for floating point modes. Fix it so
floating point mode operands are correctly handled.

	PR target/108293

gcc/

	* config/bpf/bpf.cc (bpf_print_operand): Correct handling for
	floating point modes.

gcc/testsuite/

	* gcc.target/bpf/double-1.c: New test.
	* gcc.target/bpf/double-2.c: New test.
	* gcc.target/bpf/float-1.c: New test.