port 57168634 https://crrev.com/c/1974961

Original Commit Message:

  Declare an inline method for the various backends to define based on
  alignment requirements. That way backends that might take a performance
  hit when data is not naturally aligned can specify the requirements.

  With this requirement defined, we can then specify that SIMD values
  require 16 bytes on the stack.

  This also opens up the possibility of storing 32-bit values in 32-bits,
  rather than the fixed kStackSlotSize.

Change-Id: I928fb74ccdd31393dd76bda1dc76c5dc0e32975e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1994368
Auto-Submit: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65716}