Add read only handles for the following predefined symbols

Add read only handles for the following predefined symbols
 "=="
 "[]"
 "[]="
 "this"
and use them in the code.
Committed: https://code.google.com/p/dart/source/detail?r=15942

[srdjan, 2012-12-10 22:15:43]

LGTM.

As discussed, in a future CL remove all predefined raw pointer in Symbols so
that people do not accidentally allocate handles.

https://chromiumcodereview.appspot.com/11519006/diff/1/vm/ast.h
File vm/ast.h (right):

https://chromiumcodereview.appspot.com/11519006/diff/1/vm/ast.h#newcode306
vm/ast.h:306: ASSERT(literal_.IsPredefinedHandle() || literal_.IsZoneHandle());
Do you want to merge that frequent test? It is going to be very frequent
(wherever we accept ZoneHandles, predefined handles are OK as well)

[siva, 2012-12-11 01:03:49]

Yes, Once we are done with migrating all the predefined
symbols to Handle versions we can remove the accessors to
the Raw versions.

https://chromiumcodereview.appspot.com/11519006/diff/1/vm/ast.h
File vm/ast.h (right):

https://chromiumcodereview.appspot.com/11519006/diff/1/vm/ast.h#newcode306
vm/ast.h:306: ASSERT(literal_.IsPredefinedHandle() || literal_.IsZoneHandle());
I have merged the test into one function and called it
IsNotTemporaryScopedHandle()

On 2012/12/10 22:15:44, srdjan wrote:
> Do you want to merge that frequent test? It is going to be very frequent
> (wherever we accept ZoneHandles, predefined handles are OK as well)