fix fxsave fpip value, provide tests #1900
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This is the same fix (and tests) that was merged in unicorn v1 (see https://github.com/unicorn-engine/unicorn/commit/63a445cbba18bf1313ac3699b5d25462b5d529f4/) now ported to unicorn v2. The fix makes sure that the fxsave x86/x64 instruction saves the instruction pointer (instead of zero) into the floating point context dump. This instruction is used in many modern polymorphic shellcodes. This is a new pull request, this time based on the dev branch.