Emit compile-time errors on illegal variable declarations.

Emit a compile-time error when
- declaring a local variable abstract or static.
- using built-in identifier as a type variable name.

R=johnniwinther@google.com

Committed: https://code.google.com/p/dart/source/detail?r=28080

[Johnni Winther, 2013-10-01 08:40:08]

lgtm

[karlklose, 2013-10-01 09:05:59]

Committed patchset #1 manually as r28080 (presubmit successful).