Fixed bool <-> Executability confusion and improved typing a bit.

Fixed bool <-> Executability confusion and improved typing a bit.

Passing a value of type Executability to a function expecting a bool worked only
by accident (because of the order of values in the enum). But using boolean
parameters is often a bad idea, anyway, so we use Executability directly.

Just another example why implicit type conversions in C++ are a bad idea... :-P
Committed: http://code.google.com/p/v8/source/detail?r=9013

[Erik Corry, 2011-08-25 10:06:15]

Nice catch.  Agree with the C++ comment.  This is why I always have the negative
enum value before the positive enum value.

[Erik Corry, 2011-08-25 10:06:24]

Oh, and LGTM