Subzero: Also dump live-end info for stack vars under -asm-verbose.

Subzero: Also dump live-end info for stack vars under -asm-verbose.

It's sometimes useful to know whether a use of a stack variable (as opposed to a physical register) is the last use of that variable.  For example, in a code sequence like:
  movl %edx, 24(%esp)
  movl 24(%esp), %edx
it would be nice to know whether the code sequence is merely bad (i.e., 24(%esp) will be used later), or horrible (i.e., this ends 24(%esp)'s live range).

We add stack variables to the per-instruction live-range-end annotation, but not to the per-block live-in and live-out annotations, because the latter would clutter the output greatly while adding very little actionable information.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4135
R=jvoung@chromium.org

Committed: https://gerrit.chromium.org/gerrit/gitweb?p=native_client/pnacl-subzero.git;a=commit;h=4175b2a684c1bb9f6e148825dccc2641f0390b02

[Jim Stichnoth, 2015-04-30 17:52:59]

stichnot@chromium.org changed reviewers:
+ jvoung@chromium.org, kschimpf@google.com, mtrofin@chromium.org

[jvoung (off chromium), 2015-04-30 18:33:24]

lgtm

[Jim Stichnoth, 2015-04-30 19:26:27]

Committed patchset #1 (id:1) manually as
4175b2a684c1bb9f6e148825dccc2641f0390b02 (tree was closed).