Types: cache lub bitset to avoid heap access

Types: cache lub bitset to avoid heap access

R=verwaest@chromium.org
BUG=

Committed: https://code.google.com/p/v8/source/detail?r=19786

[Toon Verwaest, 2014-03-10 12:52:18]

lgtm with comment

https://codereview.chromium.org/186743002/diff/1/src/types.h
File src/types.h (right):

https://codereview.chromium.org/186743002/diff/1/src/types.h#newcode523
src/types.h:523: return 0;
I presume this is because of the "bitset ? bitset : <compute bitset>"? Please
add a comment at least if that's the case. Or maybe give that 0 a name, eg,
kComputeBitset and compare to it, eg bitset == kComputeBitset ? <compute> :
bitset;

[rossberg, 2014-03-11 10:11:38]

https://codereview.chromium.org/186743002/diff/1/src/types.h
File src/types.h (right):

https://codereview.chromium.org/186743002/diff/1/src/types.h#newcode523
src/types.h:523: return 0;
On 2014/03/10 12:52:18, Toon Verwaest wrote:
> I presume this is because of the "bitset ? bitset : <compute bitset>"? Please
> add a comment at least if that's the case. Or maybe give that 0 a name, eg,
> kComputeBitset and compare to it, eg bitset == kComputeBitset ? <compute> :
> bitset;

Done.

[rossberg, 2014-03-11 10:28:45]

Committed patchset #2 manually as r19786 (presubmit successful).