Filler sizes have to be Smis, fix x64 breakage.

Filler sizes have to be Smis, fix x64 breakage.

BUG=
R=jkummerow@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=16355

[Jakob Kummerow, 2013-08-27 11:43:34]

LGTM with comments.

https://codereview.chromium.org/23577002/diff/1/src/hydrogen-instructions.cc
File src/hydrogen-instructions.cc (right):

https://codereview.chromium.org/23577002/diff/1/src/hydrogen-instructions.cc#...
src/hydrogen-instructions.cc:3401: Representation::Smi(),
I'd like a comment here, please. Roughly:

We must explicitly force Smi representation for this constant, because on x64 we
would otherwise automatically choose int32, but the actual store requires a
Smi-tagged value.

https://codereview.chromium.org/23577002/diff/1/src/hydrogen-instructions.cc#...
src/hydrogen-instructions.cc:3428: zone, context(), free_space_size,
Representation::Smi(), store_map);
Consider repeating the comment here, or an abbreviated version:

// Must force Smi representation for x64 (see comment above).

[Hannes Payer (out of office), 2013-08-27 11:51:13]

Committed patchset #2 manually as r16355 (presubmit successful).