Fixes issue 1215
Fixes issue 1215

Use dr_is_nudge_thread() from DR r2077 to relax the assert for being
on the app stack for malloc_iterate().

SVN-Revision: 1345

sigma-random/drmemory,code4bones/drmemory,sigma-random/drmemory,code4bones/drmemory,LohithBlaze/drmemory,code4bones/drmemory,LohithBlaze/drmemory,sigma-random/drmemory,sigma-random/drmemory,code4bones/drmemory,sigma-random/drmemory,LohithBlaze/drmemory,LohithBlaze/drmemory,code4bones/drmemory,LohithBlaze/drmemory