[Turbofan] Eliminate IsOutputRegisterOf and IsOutputFPRegisterOf checks.

[Turbofan] Eliminate IsOutputRegisterOf and IsOutputFPRegisterOf checks.
- Eliminates tests for whether a fixed register needs to be preserved,
and conservatively adds a UsePosition for all fixed live ranges.

This speeds up ProcessInstructions, especially when ARM register
aliasing introduces fixed live ranges for float and SIMD 128 registers.

LOG=N
BUG=v8:4124
Committed: https://crrev.com/cf62923e3ba3861d34a46381fb032c01ba42fb2f
Cr-Commit-Position: refs/heads/master@{#37408}

[bbudge, 2016-06-29 00:14:41]

bbudge@chromium.org changed reviewers:
+ bmeurer@chromium.org, mtrofin@chromium.org

[bbudge, 2016-06-29 00:14:41]

This doesn't seem to slow compile time down. I think it will prevent a perf
regression when I add the SIMD registers on ARM.

I ran the perf tests twice and these should be visible on the last patchset.

[Benedikt Meurer, 2016-06-29 03:49:34]

LGTM.

[bbudge, 2016-06-29 21:51:50]

The CQ bit was checked by bbudge@chromium.org

[bbudge, 2016-06-29 21:51:50]

The patchset sent to the CQ was uploaded after l-g-t-m from bmeurer@chromium.org
Link to the patchset: https://codereview.chromium.org/2103793003/#ps40001
(title: "Fix comment text.")

[commit-bot: I haz the power, 2016-06-29 21:51:54]

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, 2016-06-29 22:40:58]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-06-29 22:41:22]

Description was changed from

==========
[Turbofan] Eliminate IsOutputRegisterOf and IsOutputFPRegisterOf checks.
- Eliminates tests for whether a fixed register needs to be preserved,
and conservatively adds a UsePosition for all fixed live ranges.

This speeds up ProcessInstructions, especially when ARM register
aliasing introduces fixed live ranges for float and SIMD 128 registers.

LOG=N
BUG=v8:4124
==========

to

==========
[Turbofan] Eliminate IsOutputRegisterOf and IsOutputFPRegisterOf checks.
- Eliminates tests for whether a fixed register needs to be preserved,
and conservatively adds a UsePosition for all fixed live ranges.

This speeds up ProcessInstructions, especially when ARM register
aliasing introduces fixed live ranges for float and SIMD 128 registers.

LOG=N
BUG=v8:4124

Committed: https://crrev.com/cf62923e3ba3861d34a46381fb032c01ba42fb2f
Cr-Commit-Position: refs/heads/master@{#37408}
==========

[commit-bot: I haz the power, 2016-06-29 22:41:22]

Patchset 3 (id:??) landed as
https://crrev.com/cf62923e3ba3861d34a46381fb032c01ba42fb2f
Cr-Commit-Position: refs/heads/master@{#37408}