Introduce flag for using the fast compiler where possible....

Introduce flag for using the fast compiler where possible.

We use the fast compiler only for top-level code right now.
When always_fast_compiler is set to true, we compile with
the fast compiler whereever possible.

By default this flag is set to false. 


Committed: http://code.google.com/p/v8/source/detail?r=3381

[Lasse Reichstein, 2009-11-30 11:45:53]

LGTM

http://codereview.chromium.org/449012/diff/1/3
File src/compiler.cc (right):

http://codereview.chromium.org/449012/diff/1/3#newcode128
src/compiler.cc:128: if (shared.is_null() &&
!literal->scope()->is_global_scope() &&
Does "shared.is_null()" have a special significance? (I.e., if it isn't there,
what does it tell us about the function?)

[fschneider, 2009-11-30 12:19:19]

http://codereview.chromium.org/449012/diff/1/3
File src/compiler.cc (right):

http://codereview.chromium.org/449012/diff/1/3#newcode128
src/compiler.cc:128: if (shared.is_null() &&
!literal->scope()->is_global_scope() &&
On 2009/11/30 11:45:53, Lasse Reichstein wrote:
> Does "shared.is_null()" have a special significance? (I.e., if it isn't there,
> what does it tell us about the function?)

Good question. I'm not sure. As I understand the SharedFunctionInfo is non-null
for lazily compiled functions. I'll leave it as is for now, but have a closer
look later.