Remove all of the code in debuggerd that uses libcorkscrew directly
and replace with libbacktrace.
Also do a bit of refactoring to clean up some functions that were
passing around variables that weren't used.
Bug: 8410085
Change-Id: I27da4fbe3f12ce38a85b4432fc1119984c9c391b
Also fixed the LOG() macro to actually write to the log again, tracking
the change in _LOG() argument semantics.
Bug 8322568
Change-Id: I79330c85c26d3ffb734315b6d0f2c0bb80bd234a
