Add support for chained UNWIND_INFO

[DymOK93]

When building with optimizations, the compiler can chain RUNTIME_FUNCTION and UNWIND_INFO structures. Also see:

• https://docs.microsoft.com/en-us/cpp/build/exception-handling-x64?view=msvc-160#chained-unwind-info-structures
• https://habr.com/ru/company/aladdinrd/blog/322956/
• https://stackoverflow.com/questions/19808172/struct-runtime-function

If this isn't taken into account, the RIP update won't be read from the return address, but from an arbitrary place on the stack.