Building of spike-based simulator with memory sanitizer reports leaking
pointers if custom extension are used. This is because existing
facilities do not have a proper destructor procedure, so the objects
representing custom extentions are leaked. This commit implements
quick-and-dirty fix for the problem.
* add DECLARE_OVERLAP_INSN to bind instructions with extension
* add overlap_list.h to contain the declare of all overlapping instructions
* make func function for overlapping instruction return NULL when the coresponding
extension(s) is not supported.
Parshintsev Anatoly
Andrew Waterman
Alexander Romanov
Jerry Zhao
Weiwei Li
Chih-Min Chao