i#1726 port to ARM: update DR to fix asm define
i#1726 port to ARM: update DR to fix asm define

Updates DR to 6720bf9 to fix missing ARM define for cpp2asm_defines.

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