Don't print intrinsic flow graph with --print-flow-graph-optimized.

Only print them with --print-flow-graph.

Removed one unused method from intermediate_language.h.

R=vegorov@google.com

Review URL: https://codereview.chromium.org//725593003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41735 260f80e4-7a28-3924-810f-c04153c831b5
Reland "Suppress canonicalization of Unbox() instruction that can deoptimize."

This relands commit r41693 with additional fixes in canonicalization pass.

R=fschneider@google.com
BUG=

Review URL: https://codereview.chromium.org//726593002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41736 260f80e4-7a28-3924-810f-c04153c831b5
In ListBase always return Iterable with the correct type argument.

R=lrn@google.com

Review URL: https://codereview.chromium.org//720153003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41737 260f80e4-7a28-3924-810f-c04153c831b5