port bd0d9e7d (r37477)

  original commit message:
  This optimizes the passing of stack parameters in function calls.

  For some architectures (ia32/x64), using pushes when possible instead
  of bumping the stack and then storing parameters generates much
  smaller code, and in some cases is faster (e.g. when a push of a memory
  location can implement a memory-to-memory copy and thus elide an
  intermediate load. On others (e.g. ARM), the benefit is smaller, where
  it's only possible to elide direct stack pointer adjustment in certain cases
  or combine multiple register stores into a single instruction in other limited
  situations. On yet other platforms (ARM64, MIPS), there are no push instructions,
  and this optimization isn't used at all.

  Ideally, this mechanism would be used for both tail calls and normal calls,
  but "normal" calls are currently pretty efficient, and tail calls are very
  inefficient, so this CL sets the bar low for building a new mechanism to
  handle parameter pushing that only needs to raise the bar on tail calls for now.

  The key aspect of this change is that adjustment to the stack pointer
  for tail calls (and perhaps later real calls) is an explicit step separate from
  instruction selection and gap resolution, but aware of both, making it possible
  to safely recognize gap moves that are actually pushes.

BUG=

Review-Url: https://codereview.chromium.org/2120413002
Cr-Commit-Position: refs/heads/master@{#37508}