Implement deferred constant support

Implement deferred constant support

Compile time constants lose their const-ness if they are referred
to through a deferred prefix. This CL adds a flag to some ast node
types that remembers whether a field or closure was referred to
via a deferred prefix. If so, the compile-time const analysis flags
the value as non-const.

R=srdjan@google.com

Committed: https://code.google.com/p/dart/source/detail?r=34785

[srdjan, 2014-04-07 17:19:10]

lgtm

https://codereview.chromium.org/226953002/diff/20001/runtime/vm/ast.h
File runtime/vm/ast.h (right):

https://codereview.chromium.org/226953002/diff/20001/runtime/vm/ast.h#newcode...
runtime/vm/ast.h:1168: if (is_deferred_reference_) printf("DDDDD\n");
Why only four Ds?

[hausner, 2014-04-07 17:30:27]

Thank you.

https://codereview.chromium.org/226953002/diff/20001/runtime/vm/ast.h
File runtime/vm/ast.h (right):

https://codereview.chromium.org/226953002/diff/20001/runtime/vm/ast.h#newcode...
runtime/vm/ast.h:1168: if (is_deferred_reference_) printf("DDDDD\n");
On 2014/04/07 17:19:10, srdjan wrote:
> Why only four Ds?

Eins zwei drei vier fünf...

DDDDDone.

[hausner, 2014-04-07 17:31:37]

Committed patchset #3 manually as r34785 (presubmit successful).