Remove some uses of STL map.

Remove some uses of STL map.

This CL removes the use of STL map from freelist.cc by adding
MallocDirectChainedHashMap in hash_map.h and adding an iterator for
BaseDirectChainedHashMap there.

It also removes a use of STL map from hash_table.h that was dead code.

R=johnmccutchan@google.com

Committed: https://github.com/dart-lang/sdk/commit/e933f28a18c7edb468390beafb4ae566dd0542dd

[zra, 2016-06-21 20:53:30]

zra@google.com changed reviewers:
+ asiva@google.com, johnmccutchan@google.com

[Cutch, 2016-06-21 21:06:25]

lgtm

[Florian Schneider, 2016-06-21 21:09:21]

fschneider@google.com changed reviewers:
+ fschneider@google.com

[Florian Schneider, 2016-06-21 21:09:22]

drive-by question: do you see any improvement in binary size with this CL?

[zra, 2016-06-21 22:03:45]

On 2016/06/21 21:09:22, Florian Schneider wrote:
> drive-by question: do you see any improvement in binary size with this CL?

It gets slightly bigger:
ReleaseX64 stripped:
Before 10277632
After  10281728

Sill have map, and now also have MallocDirectChainedHashMap.

[zra, 2016-06-22 15:32:40]

Description was changed from

==========
Remove some uses of STL map.

This CL removes the use of STL map from freelist.cc by adding
MallocDirectChainedHashMap in hash_map.h and adding an iterator for
BaseDirectChainedHashMap there.

It also removes a use of STL map from hash_table.h that was dead code.
==========

to

==========
Remove some uses of STL map.

This CL removes the use of STL map from freelist.cc by adding
MallocDirectChainedHashMap in hash_map.h and adding an iterator for
BaseDirectChainedHashMap there.

It also removes a use of STL map from hash_table.h that was dead code.

R=johnmccutchan@google.com

Committed:
https://github.com/dart-lang/sdk/commit/e933f28a18c7edb468390beafb4ae566dd0542dd
==========

[zra, 2016-06-22 15:32:42]

Committed patchset #1 (id:1) manually as
e933f28a18c7edb468390beafb4ae566dd0542dd (presubmit successful).