Turbofan optimizes TruncateInt64ToInt32 by trying to merge it into
its input. This can avoid generating a movl instruction. However, when
the input is BitcastTaggedToWordForTagAndSmiBits, it fails to apply
this optimization and this results in a redundant move:

  Turbofan IR:
  149: Load[kRepTaggedSigned|kTypeInt32](...)
  150: BitcastTaggedToWordForTagAndSmiBits(149)
  151: TruncateInt64ToInt32(150)
  152: Word32And(151, 558)

  Assembly:
  103  movl r11,[r8+0x1f]
  107  movl r11,r11
  10a  andl r11,0x4

This CL fixes this and avoids the redundant movl instruction.

Change-Id: Id59d1ce1e3b139344f750e903726dd9f338cfdba
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3787681Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Hao A Xu <hao.a.xu@intel.com>
Cr-Commit-Position: refs/heads/main@{#82156}