Subzero: Improve debugging controls, plus minor refactoring.

Subzero: Improve debugging controls, plus minor refactoring.

1. Decorate the list of live-in and live-out variables with register assignments in the dump() output.  This helps one to assess register pressure.

2. Fix a bug where the DisableInternal flag wasn't being honored for function definitions.

3. Add a -translate-only=<symbol> to limit translation to a single function or global variable.  This makes it easier to focus on debugging a single function.

4. Change the -no-phi-edge-split option to -phi-edge-split and invert the meaning, to better not avoid the non double negatives.

BUG= none
R=jvoung@chromium.org

Committed: https://gerrit.chromium.org/gerrit/gitweb?p=native_client/pnacl-subzero.git;a=commit;h=088b2be278dde516d097caec0d1bfb5c47e7bb04

[Jim Stichnoth, 2014-10-23 13:38:32]

stichnot@chromium.org changed reviewers:
+ jvoung@chromium.org

[jvoung (off chromium), 2014-10-23 15:44:20]

LGTM but would be good to summarize a bit some of the changes in the commit
message. E.g., DisableInternal is now checked for global variables?

[Jim Stichnoth, 2014-10-23 15:54:01]

On 2014/10/23 15:44:20, jvoung wrote:
> LGTM but would be good to summarize a bit some of the changes in the commit
> message. E.g., DisableInternal is now checked for global variables?

Oops, thanks, I forgot to expand that out.

[jvoung (off chromium), 2014-10-23 17:09:51]

On 2014/10/23 15:54:01, stichnot wrote:
> On 2014/10/23 15:44:20, jvoung wrote:
> > LGTM but would be good to summarize a bit some of the changes in the commit
> > message. E.g., DisableInternal is now checked for global variables?
> 
> Oops, thanks, I forgot to expand that out.

Thanks!

[Jim Stichnoth, 2014-10-23 19:02:27]

Committed patchset #1 (id:1) manually as
088b2be278dde516d097caec0d1bfb5c47e7bb04 (presubmit successful).