Mark empty HashMap constructor as NoThrows.

BUG=
R=karlklose@google.com

Review URL: https://codereview.chromium.org//769533003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42158 260f80e4-7a28-3924-810f-c04153c831b5
Move isolateStaticClosureAccess and isolateLazyInitializerAccess from namer to emitter.

R=floitsch@google.com

Review URL: https://codereview.chromium.org//784843002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42159 260f80e4-7a28-3924-810f-c04153c831b5
invoke computeCache when priority sources change

BUG=
R=scheglov@google.com

Review URL: https://codereview.chromium.org//787553002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42160 260f80e4-7a28-3924-810f-c04153c831b5