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gctest failure on sparc-solaris


With a fresh checkout I'm now seeing:

Thread 1 creation failed 4294967295
Test failed
Abort
FAIL: gctest
===================
1 of 1 tests failed
===================

A little investigation shows that error == ENOMEM and 
GC_scratch_alloc(1024*1024) is failing.  Defining MMAP_STACKS is a
workaround.  (Why not just use MMAP_STACKS by default?  My tests show that
using MMAP_STACKS with a calloc'ed GET_MEM reduces stack blacklisting
considerably on this platform.)

Jeff


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