[D-runtime] druntime commit, revision 496

[Walter Bright]

This change breaks the windows dll tests.

dsource.org wrote:
> druntime commit, revision 496
>
>
> user: schveiguy
>
> msg:
> Array append LRU cache prevents array memory from being collected.  This fixes that problem.  See bugzilla 3929
>
> Implemented via malloc/free for the cache, and and also a hook from the GC to allow purging of the caches during a collection cycle.
>
> Deleting an array also now removes it from the cache.
>
> UNTESTED ON MACOSX!  Works on Windows/Linux.
>
> http://www.dsource.org/projects/druntime/changeset/496
>
> paths changed:
> U   trunk/src/core/thread.d
> U   trunk/src/gc/gc.d
> U   trunk/src/gc/gcx.d
> U   trunk/src/rt/lifetime.d
>
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