Fix mismatched malloc/free delete/new.

Modify the monitor code to override the delete operator. The problem
is the new operator is overloaded to return a pointer returned by
posix_memalign, but then it's freed with a delete, not a free call.

Also, fix the debugger code to use the [] for a std::unique_ptr to
match how the value is actually allocated.

Both problems found by ASAN.

Bug: 18202869

Change-Id: I2f3a2c02a7f35399b7ba6717b08a035089fab00d