Diff mt_allocator.h part 1 of item 3

[Stefan Olsson]

Hi,

here's the first part of the patch that addresses item 3 in the rfc - 
the one that will reuse thread id's as soon as possible by changing the 
behaviour of thread_freelist to do "push_front" when threads die instead 
of "push_back". I know that it seems like a lot of patches, but I really 
want to make sure that everyone sees what is being altered.

At the same time - after some reading up - we have added keyword 
volatile to the global vars affected by this patch and if no-one has an 
other opinion, we will do this where it makes sense on other global vars 
(such as the freelists etc) as well.

Brgds

/Stefan

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