A few tweaks done to the heap.py in me free time where we now have:

(lldb) command script import heap.py

Find all malloc blocks that contains a pointer value of 0x1234000:
(lldb) ptr_refs 0x1234000

Find all malloc blocks that contain a C string:
(lldb) cstr_refs "hello"

Get info on a malloc block that starts at or contains 0x12340000
(lldb) malloc_info 0x12340000

llvm-svn: 154602