aco: rename is_cmp to is_fp_cmp

The old name is no longer accurate.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18077>

src/amd/compiler/aco_ir.cpp

@@ -746,7 +746,7 @@ get_cmp_bitsize(aco_opcode op)
 }
 
 bool
-is_cmp(aco_opcode op)
+is_fp_cmp(aco_opcode op)
 {
    CmpInfo info;
    return get_cmp_info(op, &info) && info.ordered != aco_opcode::num_opcodes;