Add alias disambiguation for VM fields.

Add alias disambiguation for VM fields.

This is needed for generalizing allocation sinking to
work with instance fields and plain field offsets.

MaterializeObject now works with  a set of Field/Smi objects
Right now this should be performance-neutral, but it already
simplifies the code be removing the fake fields previously used
for type arguments, closure function/context.

R=srdjan@google.com

Committed: https://code.google.com/p/dart/source/detail?r=33478

[srdjan, 2014-03-07 17:38:36]

LGTM with comment

https://codereview.chromium.org/189513003/diff/1/runtime/vm/intermediate_lang...
File runtime/vm/intermediate_language.h (right):

https://codereview.chromium.org/189513003/diff/1/runtime/vm/intermediate_lang...
runtime/vm/intermediate_language.h:4075: class MaterializeObjectInstr : public
Definition {
Please rename 'fields' to fields_or_offsets'. Such a name can be used instead of
additional argument documentation. Also on other places as well.

[Florian Schneider, 2014-03-10 09:46:48]

https://codereview.chromium.org/189513003/diff/1/runtime/vm/intermediate_lang...
File runtime/vm/intermediate_language.h (right):

https://codereview.chromium.org/189513003/diff/1/runtime/vm/intermediate_lang...
runtime/vm/intermediate_language.h:4075: class MaterializeObjectInstr : public
Definition {
On 2014/03/07 17:38:37, srdjan wrote:
> Please rename 'fields' to fields_or_offsets'. Such a name can be used instead
of
> additional argument documentation. Also on other places as well.

Done. Renamed to 'slots' since I prefer a concise name.

[Florian Schneider, 2014-03-10 09:59:55]

Committed patchset #1 manually as r33478 (presubmit successful).