[kaffe] gc patch

[Helmer Krämer]

Hi all,

I've attached a small patch to kaffe's gc and would like to
hear your opinions before commiting it.

On the one hand, it provides for a cleaner seperation between
heap management and garbage collection. Therefore, it moves any
logic how one could free some memory out of gc_heap_malloc into
gcMalloc. Second, gc_system_alloc is renamed to gc_heap_grow and
exported so that gcMalloc can call it.

On the other hand, it contains some bugfixes. The memory that's
allocated by the heap manager is no longer aligned at a hard coded
8 byte boundary, but rather at a ALIGNMENT_OF_SIZE(sizeof(jdouble))
boundary. Second, the initialization of a block in gc_small_block
was somewhat wrong (think that's what's causing the SIGBUS on
HPUX).

Comments?

Greetings,
Helmer
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