Add a new program for checking the correctness of the computed stack from a trace.

Add a new program for checking the correctness of the computed stack from a trace.

The check_stack program checks that the generated stack that includes both
native functions and Java methods (generated from the emulator instruction
trace plus the method trace) is consistent with the stack of Java methods
that is computed from the method trace alone. (The method trace is
generated by the Dalvik interpreter).