Implement IS_OBJECT and IS_FUNCTION as inlined runtime functions....

Implement IS_OBJECT and IS_FUNCTION as inlined runtime functions.

Summary:
This change fixes a performance regression introduced by the special
handling of regular expressions in typeof expressions.
As a result we regain ~8% speedup on 3d-raytrace and ~13% on boyer
(vs bleeding edge)

Description:
The macros IS_OBJECT and IS_FUNCTION are frequently used in the 
JS runtime functions. 
By introducing new inlined runtime functions %_IsFunction and %_IsObject
we avoid invoking the more expensive %_ClassOf function plus comparing
its result to a string. 



Committed: http://code.google.com/p/v8/source/detail?r=3335

[Mads Ager (chromium), 2009-11-19 07:16:48]

LGTM

http://codereview.chromium.org/399111/diff/1/8
File src/arm/codegen-arm.cc (right):

http://codereview.chromium.org/399111/diff/1/8#newcode3404
Line 3404: // It can be an undetectable object.
Maybe explicitly mention that undetectable objects have to act as undefined in
typeof tests?

[fschneider, 2009-11-19 07:35:51]

http://codereview.chromium.org/399111/diff/1/8
File src/arm/codegen-arm.cc (right):

http://codereview.chromium.org/399111/diff/1/8#newcode3404
Line 3404: // It can be an undetectable object.
On 2009/11/19 07:16:48, Mads Ager wrote:
> Maybe explicitly mention that undetectable objects have to act as undefined in
> typeof tests?

Done.