Subzero: Improve the usability of UnimplementedError during lowering.

Subzero: Improve the usability of UnimplementedError during lowering.

Provides a variant of the UnimplementedError macro specifically for use in incomplete target instruction lowering.  When --skip-unimplemented is specified, the UnimplementedLoweringError macro adds FakeUse and FakeDef instructions in order to maintain consistency in liveness analysis.

BUG= none
R=kschimpf@google.com

Committed: https://gerrit.chromium.org/gerrit/gitweb?p=native_client/pnacl-subzero.git;a=commit;h=91c773e1a2bccbb2e2f848f42fc36285cf5f12a5

[Jim Stichnoth, 2016-01-15 22:32:04]

Description was changed from

==========
Subzero: Improve the usability of UnimplementedError during lowering.

BUG= none
==========

to

==========
Subzero: Improve the usability of UnimplementedError during lowering.

Provides a variant of the UnimplementedError macro specifically for use in
incomplete target instruction lowering.  When --skip-unimplemented is specified,
the UnimplementedLoweringError macro adds FakeUse and FakeDef instructions in
order to maintain consistency in liveness analysis.

BUG= none
==========

[Jim Stichnoth, 2016-01-15 22:32:04]

stichnot@chromium.org changed reviewers:
+ jpp@chromium.org, kschimpf@google.com, reed.kotler@imgtec.com,
sehr@chromium.org

[Jim Stichnoth, 2016-01-15 22:47:13]

Adding +eholk to the cc list because this is relevant to ARM vector lowering. 
(Can't add Eric as a reviewer until permissions get set up.)

[Karl, 2016-01-19 16:01:40]

lgtm

[Jim Stichnoth, 2016-01-19 17:52:25]

Description was changed from

==========
Subzero: Improve the usability of UnimplementedError during lowering.

Provides a variant of the UnimplementedError macro specifically for use in
incomplete target instruction lowering.  When --skip-unimplemented is specified,
the UnimplementedLoweringError macro adds FakeUse and FakeDef instructions in
order to maintain consistency in liveness analysis.

BUG= none
==========

to

==========
Subzero: Improve the usability of UnimplementedError during lowering.

Provides a variant of the UnimplementedError macro specifically for use in
incomplete target instruction lowering.  When --skip-unimplemented is specified,
the UnimplementedLoweringError macro adds FakeUse and FakeDef instructions in
order to maintain consistency in liveness analysis.

BUG= none
R=kschimpf@google.com

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

[Jim Stichnoth, 2016-01-19 17:52:26]

Committed patchset #1 (id:1) manually as
91c773e1a2bccbb2e2f848f42fc36285cf5f12a5 (presubmit successful).