Increase some sizes to deal better with the new multigigabyte world:

- on 64-bit platforms, double the size of the supported address
  space to 32G.

- Increase the size of the ExeContext table 6 times.  Some very
  large apps have been observed to have been doing a lot of 
  searching in the old 4999 entry table.  This table may be
  OSetified in the fullness of time.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@4808 a5019735-40e9-0310-863c-91ae7b9d1cf9
4 files changed