[m-rev.] for review: revert HBLKSIZE increase on linux

[Peter Wang]

On 2011-04-28, Julien Fischer <juliensf at csse.unimelb.edu.au> wrote:
> >
> >My patch doesn't touch anything so early in the runtime initialisation.
> >It bootchecks in all non-.par grades that I've tested.
> >It also bootchecks in .par grades, if I revert the HBLKSIZE change.
> 
> Perhaps it's related to displacing pointers by an extra word with
> memory attribution enabled?

No, I just happened to use ./configure --enable-gc-munmap in that
workspace.  That also explains why I didn't see the problem on 32-bit
linux, where I didn't use that option.

Peter
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