Fix Manticore <-> Unicorn context switch

[Boyan-MILANOV]

Summary of the problem

Opening this issue for traceability after merging #2511.
#2511 added new FPU registers (FIP, FDP, ...) to manticore. Those registers were also missing in Unicorn and have been added by their team since, although in their dev branch which is not yet merged into master. Thus, manticore currently ignores those registers when syncing the CPU context with unicorn:

manticore/manticore/utils/emulate.py

Line 92 in bf2fba3

self.ignore_registers = {"FIP", "FOP", "FDS", "FCS", "FDP", "MXCSR_MASK"}

When Unicorn has a new release and adds the new registers to their python API we can stop ignoring them during the context switch.

[Boyan-MILANOV]

#2564 updates to unicorn 2.0 which now supports all these registers except MXCSR_MASK.