[cleanup] Remove dead code from Variable and simplify PatternRewriter slightly

[cleanup] Remove dead code from Variable and simplify PatternRewriter slightly

Both bits of code were pointed out by our test coverage tools.

R=gsathya@chromium.org

Committed: https://crrev.com/707934cf9e5be32769538f0e2d84e3526666dbc4
Cr-Commit-Position: refs/heads/master@{#40095}

[adamk, 2016-10-07 18:15:51]

The CQ bit was checked by adamk@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-10-07 18:15:58]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[gsathya, 2016-10-07 18:45:03]

lgtm

[adamk, 2016-10-07 18:45:53]

The CQ bit was unchecked by adamk@chromium.org

[adamk, 2016-10-07 18:45:56]

The CQ bit was checked by adamk@chromium.org

[commit-bot: I haz the power, 2016-10-07 18:46:01]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-07 18:53:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-07 18:53:27]

Description was changed from

==========
[cleanup] Remove dead code from Variable and simplify PatternRewriter slightly

Both bits of code were pointed out by our test coverage tools.

R=gsathya@chromium.org
==========

to

==========
[cleanup] Remove dead code from Variable and simplify PatternRewriter slightly

Both bits of code were pointed out by our test coverage tools.

R=gsathya@chromium.org

Committed: https://crrev.com/707934cf9e5be32769538f0e2d84e3526666dbc4
Cr-Commit-Position: refs/heads/master@{#40095}
==========

[commit-bot: I haz the power, 2016-10-07 18:53:29]

Patchset 1 (id:??) landed as
https://crrev.com/707934cf9e5be32769538f0e2d84e3526666dbc4
Cr-Commit-Position: refs/heads/master@{#40095}