Version 0.2.9.3

Merge revision 16089, 16091, 16093, 16094, 16096, 16099 to trunk.

Fixes issues with unicode support in dart:io, always archive before
test on dartium trunk builders, and makes sure a constant that was
used before but removed from the graph gets inserted back in the graph
when it's re-used in dart2js.
Review URL: https://codereview.chromium.org//11571005

git-svn-id: http://dart.googlecode.com/svn/trunk@16102 260f80e4-7a28-3924-810f-c04153c831b5

• runtime/bin/main.cc[diff]
• runtime/bin/process_win.cc[diff]
• runtime/bin/socket_win.cc[diff]
• runtime/bin/utils.h[diff]
• runtime/bin/utils_android.cc[diff]
• runtime/bin/utils_linux.cc[diff]
• runtime/bin/utils_macos.cc[diff]
• runtime/bin/utils_win.cc[diff]
• runtime/platform/globals.h[diff]
• sdk/lib/_internal/compiler/implementation/ssa/nodes.dart[diff]
• sdk/lib/_internal/compiler/implementation/ssa/optimize.dart[diff]
• tools/VERSION[diff]