Relanding: avoiding creating strings for canonicalization

Relanding: avoiding creating strings for canonicalization

Do a hash table for tripples:
(list of bytes, start, end) --> canonicalized string

R=ahe@google.com

Committed: https://github.com/dart-lang/sdk/commit/aa1e6d4ccf3c43f23d7e2e5bd0fed030f1fa4d38

[Dmitry Olshansky, 2017-02-17 17:20:56]

dmitryolsh@google.com changed reviewers:
+ ahe@google.com

[ahe, 2017-02-20 09:18:30]

lgtm

https://codereview.chromium.org/2702753003/diff/1/pkg/front_end/lib/src/fasta...
File pkg/front_end/lib/src/fasta/scanner/canonicalizer.dart (right):

https://codereview.chromium.org/2702753003/diff/1/pkg/front_end/lib/src/fasta...
pkg/front_end/lib/src/fasta/scanner/canonicalizer.dart:1: // Copyright (c) 2017,
the Dart project authors.  Please see the AUTHORS file
Consider renaming this file to string_canonicalizer.dart.

https://codereview.chromium.org/2702753003/diff/1/pkg/front_end/lib/src/fasta...
pkg/front_end/lib/src/fasta/scanner/canonicalizer.dart:18: /**
FWIW, I think we're shifting towards preferring three slashes over /**.

[Dmitry Olshansky, 2017-02-20 14:19:17]

Description was changed from

==========
Relanding: avoiding creating strings for canonicalization

Do a hash table for tripples:
(list of bytes, start, end) --> canonicalized string
==========

to

==========
Relanding: avoiding creating strings for canonicalization

Do a hash table for tripples:
(list of bytes, start, end) --> canonicalized string

R=ahe@google.com

Committed:
https://github.com/dart-lang/sdk/commit/aa1e6d4ccf3c43f23d7e2e5bd0fed030f1fa4d38
==========

[Dmitry Olshansky, 2017-02-20 14:19:19]

Committed patchset #2 (id:20001) manually as
aa1e6d4ccf3c43f23d7e2e5bd0fed030f1fa4d38 (presubmit successful).