Record the elements on identifiers in the AST referring to types.

Record the elements on identifiers in the AST referring to types.

When dartc resolved a type, in the past it did not set the elements for the type 
on the AST ( you had to go through the type).  This is a bit tedious in the IDE,
so we are going to try to fill in more of the symbols in the AST.

Committed: https://code.google.com/p/dart/source/detail?r=3449

[scheglov, 2012-01-19 20:23:57]

No tests?
Is it possible to enable ResolverAuditVisitor, but report only failures to
resolve in some cases, which should work, like DartTypeNode?

[zundel, 2012-01-19 20:33:18]

On 2012/01/19 20:23:57, scheglov wrote:
> No tests?
> Is it possible to enable ResolverAuditVisitor, but report only failures to
> resolve in some cases, which should work, like DartTypeNode?

I have a test which is commented out in ResolverTestCase.  The idea is that
eventually all nodes will be resolved to elements, but this only addresses
identifiers which are types.  I could go to the ResovlerCompilerTest and add
some exlicit checks, I suppose, but my dream was to turn on this audit visitor
for all ResolverTests.  Right now, some of the tests fail when I uncomment it. 
What Brian pointed out is that we need to some how mark identifiers that we
tried but failed to resolve so we can distinguish them from those we just
'forgot'.

[scheglov, 2012-01-19 20:34:59]

lgtm