RTEMS | cpukit/libdl/arm: Fix trampoline alignment (!367)

[Ranulfo Raphael (@ranulfo)]

Ranulfo Raphael created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/367

Project:Branches: ranulfo/rtems:6-fix_arm_tramp_alignment to rtems/rtos/rtems:6
Author:   Ranulfo Raphael




## Summary

cpukit/libdl/arm: Fix trampoline alignment

This commit aligns trampolines for THUMB and ARM instructions
(CALL/JUMP24 and THM_JUMP24/THM_PC22).

According to the ARM technical reference in section "Register-relative
and PC-relative expressions":

    In Thumb code:
    - For B, BL, CBNZ, and CBZ instructions, the value of the PC is the
      address of the current instruction plus 4 bytes.
    - For all other instructions that use labels, the value of the PC is
      the address of the current instruction plus 4 bytes, with bit[1]
      of the result cleared to 0 to make it word-aligned.

https://developer.arm.com/documentation/dui0473/m/symbols--literals--expressions--and-operators/register-relative-and-pc-relative-expressions
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