JIT: remove jumps at the end of every micro op on aarch64

[diegorusso]

Feature or enhancement

Bug description:

AArch64 JIT stencils contain a jump at the end of every micro op:

...
    // d4: a8c17bfd      ldp     x29, x30, [sp], #0x10
    // d8: 14000000      b       0xd8 <_JIT_ENTRY+0xd8>
    // 00000000000000d8:  R_AARCH64_JUMP26     _JIT_CONTINUE

These jumps need to be removed and replaced with no-ops to keep the alignment of 8 bytes.
Also the current padding mechanism needs to be removed as well.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

• gh-130887: remove trailing jump in AArch64 JIT stencils #131042