fix static members in _emitMemberName

fix static members in _emitMemberName
static/top-levels don't need extension method, operator renames, or different slots* for private members

(static members are qualified by the static type, so they aren't ambiguous, e.g. Foo._foo and Bar._foo where Foo and Bar are in same/different libraries)

R=jacobr@google.com

Committed: https://github.com/dart-lang/dev_compiler/commit/785d4c74ffda3656248194286bf2b5ee4fb849d3

[Jennifer Messerly, 2015-04-28 19:34:20]

jmesserly@google.com changed reviewers:
+ jacobr@google.com, vsm@google.com

[Jennifer Messerly, 2015-04-29 19:44:08]

Found some more cases that weren't handled.

[Jacob, 2015-04-29 21:38:38]

lgtm

[Jennifer Messerly, 2015-04-29 21:45:17]

Committed patchset #2 (id:20001) manually as
785d4c74ffda3656248194286bf2b5ee4fb849d3 (presubmit successful).