Build elements for local variable and label in functions/methods.

R=brianwilkerson@google.com
BUG=

Review URL: https://codereview.chromium.org//746903002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41919 260f80e4-7a28-3924-810f-c04153c831b5
Resolve not-equals operator

R=scheglov@google.com

Review URL: https://codereview.chromium.org//747153002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41920 260f80e4-7a28-3924-810f-c04153c831b5