add tests of alloca and both types of special shadow write
add tests of alloca and both types of special shadow write

SVN-Revision: 340

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