fixes issue 434 + increase alloc gencode to 2 pages, and change prot on whole region   to avoid boundary crossing problems
fixes issue 434
+ increase alloc gencode to 2 pages, and change prot on whole region
  to avoid boundary crossing problems

git-svn-id: fe3cd4388a6e5a968b09397a3d721fe124e8117a@329 5b54908e-ead4-fc18-b48a-0285e6dbc711

rnk/drmemory,rnk/drmemory,rnk/drmemory,rnk/drmemory