handle imm8 for sub instruction too

Signed-off-by: Hagen Paul Pfeifer <hagen@jauu.net>
fix used before init bug

Signed-off-by: Hagen Paul Pfeifer <hagen@jauu.net>
generate stack analysis

Signed-off-by: Hagen Paul Pfeifer <hagen@jauu.net>
stack histogram checker added

Signed-off-by: Hagen Paul Pfeifer <hagen@jauu.net>