Avoid multiple reallocations of StringBuffer._parts

Avoid multiple reallocations of StringBuffer._parts

The original code

    _parts = [ str ];

allocated a _GrowableList backed by a single element _List.
Subsequent calls to _parts.add() grows the backing list to 2, then 4, etc.

On a dart2js workload, allocating with a reasonable initial capacity
reduces the number of _List objects allocated by 8%, with 4% reduction in
_List bytes allocated.

R=lrn@google.com

Committed: https://github.com/dart-lang/sdk/commit/2bb2a12720db04afcf6162d3e4a7e30ed638ae1e

[sra1, 2016-04-16 23:40:25]

Description was changed from

==========
Avoid multiple reallocations of StringBuffer._parts

The original code

    _parts = [ str ];

allocated a _GrowableList backed by a single element _List.
Subsequent calls to _parts.add() grow the backing list to 2, then 4, etc.

On a dart2js workload, allocating with a reasonable initial capacity
reduces the number of _Lists allocated by 8%, with 4% reduction in
_List bytes allocated (and GC-ed).
==========

to

==========
Avoid multiple reallocations of StringBuffer._parts

The original code

    _parts = [ str ];

allocated a _GrowableList backed by a single element _List.
Subsequent calls to _parts.add() grows the backing list to 2, then 4, etc.

On a dart2js workload, allocating with a reasonable initial capacity
reduces the number of _Lists allocated by 8%, with 4% reduction in
_List bytes allocated (and GC-ed).
==========

[sra1, 2016-04-16 23:40:25]

sra@google.com changed reviewers:
+ lrn@google.com

[sra1, 2016-04-16 23:43:43]

Description was changed from

==========
Avoid multiple reallocations of StringBuffer._parts

The original code

    _parts = [ str ];

allocated a _GrowableList backed by a single element _List.
Subsequent calls to _parts.add() grows the backing list to 2, then 4, etc.

On a dart2js workload, allocating with a reasonable initial capacity
reduces the number of _Lists allocated by 8%, with 4% reduction in
_List bytes allocated (and GC-ed).
==========

to

==========
Avoid multiple reallocations of StringBuffer._parts

The original code

    _parts = [ str ];

allocated a _GrowableList backed by a single element _List.
Subsequent calls to _parts.add() grows the backing list to 2, then 4, etc.

On a dart2js workload, allocating with a reasonable initial capacity
reduces the number of _List objects allocated by 8%, with 4% reduction in
_List bytes allocated.
==========

[Lasse Reichstein Nielsen, 2016-04-18 20:59:36]

lgtm

[sra1, 2016-04-19 01:08:26]

Description was changed from

==========
Avoid multiple reallocations of StringBuffer._parts

The original code

    _parts = [ str ];

allocated a _GrowableList backed by a single element _List.
Subsequent calls to _parts.add() grows the backing list to 2, then 4, etc.

On a dart2js workload, allocating with a reasonable initial capacity
reduces the number of _List objects allocated by 8%, with 4% reduction in
_List bytes allocated.
==========

to

==========
Avoid multiple reallocations of StringBuffer._parts

The original code

    _parts = [ str ];

allocated a _GrowableList backed by a single element _List.
Subsequent calls to _parts.add() grows the backing list to 2, then 4, etc.

On a dart2js workload, allocating with a reasonable initial capacity
reduces the number of _List objects allocated by 8%, with 4% reduction in
_List bytes allocated.

R=lrn@google.com

Committed:
https://github.com/dart-lang/sdk/commit/2bb2a12720db04afcf6162d3e4a7e30ed638ae1e
==========

[sra1, 2016-04-19 01:08:28]

Committed patchset #1 (id:1) manually as
2bb2a12720db04afcf6162d3e4a7e30ed638ae1e (presubmit successful).