[XCOFF] Use RLDs to print branches even without -r (#74342)

This presents misleading and confusing output. If you have a function
defined at the beginning of an XCOFF object file, and you have a
function call to an external function, the function call disassembles as
a branch to the local function. That is,

`void f() { f(); g();}`

disassembles as 
>00000000 <.f>:
       0: 7c 08 02 a6   mflr 0
4: 94 21 ff c0 stwu 1, -64(1)
       8: 90 01 00 48   stw 0, 72(1)
      c: 4b ff ff f5   bl 0x0 <.f>
      10: 4b ff ff f1   bl 0x0 <.f> 

With this PR, the second call will display:

`10: 4b ff ff f1   bl 0x0 <.g>  `

Using -r can help, but you still get the confusing output:

>10: 4b ff ff f1   bl 0x0 <.f>
      00000010:  R_RBR        .g