Ensure that MaterializeObject has relaxed RequiredInputRepresentation.
Ensure that MaterializeObject has relaxed RequiredInputRepresentation.

Instruction itself is essentially a part of a deoptimization enviroment and thus can deal with any representation.

Default RequiredInputRepresentation is too strict and require tagged representation for all inputs which leads to ineffecient code: SelectRepresentations pass which is run while materializations are still in the graph will insert redundant boxing.

R=srdjan@google.com
BUG=dart:16063

Review URL: https://codereview.chromium.org//136923004

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@31753 260f80e4-7a28-3924-810f-c04153c831b5

dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk