Have MemberMap backed by a HashMap, not an array (issue 187803004)

[jw...@google.com]

Reviewers: scheglov,

Description:
Have MemberMap backed by a HashMap, not an array

BUG=

Please review this at https://codereview.chromium.org/187803004/

SVN Base: https://dart.googlecode.com/svn/branches/bleeding_edge/dart

Affected files (+96, -106 lines):

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/resolver/InheritanceManager.java

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/resolver/MemberMap.java

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/verifier/ErrorVerifier.java

[jw...@google.com]

https://codereview.chromium.org/187803004/